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3 Month Old Baby: Development, Sleep and Milestones

A child is an extremely complex and vulnerable socio-biological system. The foundations of the health of the future adult are laid in infancy.

It is advisable to make an adequate assessment of the characteristics of the corresponding age stage to monitor the health and development of the child. It is necessary to compare the most important vital signs of a particular child with the accepted standards for his age group.

The main indicators are growth and development. This is a quantitative and qualitative change in the body that is accompanied by an increase in the level of its complexity. We will describe in this article all the moments of development and care for a child of 3 months of age.

3 Month Baby Development

An infant goes through the stage of improvement of the most important systems and organs at 3 months. Now the baby has gained weight, strengthened his muscular system, and achieves a large number of successful physical records. He learns new skills and is more and more in contact with the external environment.

Physiological, mental, and emotional progress is very noticeable at this age stage. The child no longer looks helpless. He is active and cheerful.

It's The Size of
a Strawberry

Based on length and size of a baby at 10 weeks pregnancy we can compare it to strawberry.

It does not feel like anything yet inside your belly, but structure is there and soon enough it will grow big.

10 Week Baby Size

How Heavy is it?
0.15 oz ~ 4 gr

Bone structure and enlargement of head has made our baby at least to double in weight between week 9 and 10.

Slowly growing baby fetus is now at 4 grams or 0.15 ounces. Keep in mind that every baby weight during pregnancy is slightly different.

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Your Baby is
3.2 CM or 1.25 Inch

It’s hard to measure baby inside your belly during such early development stage.

Overall night is just above one inch or 3 cm. The baby is not measured head to toe yet as it is in round position.

Size week 10

Baby parts development summary

The baby is noticeably rounded by 3 months of age. He has charming cheeks and folds on his arms and legs. The subcutaneous layer of fat grows. Thermoregulation gradually improves. The upper part of the body develops more intensively in the child in the first postnatal period. This is due to the peculiarities of blood circulation. It is the upper section that is supplied with more oxygen.

The most important system for the life of the baby at this stage of development is being improved. It’s about the digestive tract. The reflex activity also fades and the nervous system develops.

Skin – Subcutaneous fat is actively growing at 3 months. The epidermis thickens making the skin denser and enhancing its protective functions. The horny layer of the skin appears, which was previously absent.

Muscles – Tonic activity of the muscles of the back and neck is manifested by the 3rd month of life. The child begins to hold his head upright for the first time thanks to this. The mass of skeletal muscles is still small. They are still poorly provided with oxidative enzymes.

Digestive tractThe stomach expands. This increases the volume of milk servings needed to saturate the baby. The microflora is still imperfect. The enzymatic immaturity of the gastrointestinal tract does not allow the child to digest food other than mother’s milk and an adapted formula.

Nervous systemThe stage of generalized reflexes appears from 3–4 months of age. There is a generalization of reflex activity. This is manifested by erratic motor activity when exposed to a stimulus. The reason is the weakness of the inhibitory processes. There is wide irradiation of excitation in the central nervous system.

Immune systemThe baby’s immunity is slightly strengthened by 3 months. The endocrine system is not yet perfect. The defense mechanisms of the baby react to the penetration of microbes and viruses, but the immune memory is not yet formed.

BrainThe volume of the brain is growing. There is a rapid increase in the number of synapses in the cerebral cortex. The transmission of information to the cerebral cortex is accelerated due to the myelination of the visual pathways. Improves perception of the external environment.

Your Baby Growth at 3 month

The child every month increases size by approximately the same amount of weight and height according to all standards. Spasmodic growth is rare and mostly there is a uniform increase in all indicators. The head circumference of girls is 40 cm. This parameter for boys is 41.2 cm. The girth of the chest of girls of 3 months is 38 cm. Boys – 39 cm.

3 Month Old Baby Milestones

The direction of the increased attention of the child is shifted towards the development of communication skills with the active development of the brain. The kid purposefully interacts with the external environment and objects. It exhibits an emotional response to stimuli, whether positive or negative.

Serious progress in visual reactions and auditory orienting reactions is noticeable by 3 months of age. The child develops by leaps and bounds. The perception of information is accelerated and its processing becomes more productive. The kid remembers his feelings and reproduces the same reactions to repetitive actions.

Vision Synaptogenesis contributes to the improvement of visual-orienting reactions. The child carefully examines objects and monitors their approach or removal. He turns his head towards the object of interest to him.

Rhythmic activity is found in the visual cortex during quiet wakefulness at 3 months of age. There is an active interaction and unification of the two main channels of visual perception - the detection of objects and the identification of their features. The system of perception of the yellow-blue component of the color matures.

Hearing The infant is characterized by distinct auditory concentration at 3 months. The desire to satisfy the developing cognitive need stimulates the perception of objects in the external world. This is great for hearing development.

The perception of information comes from different sides. Assimilation of sounds enriches the brain with new neural connections. Hearing becomes one of the main stimuli of attention. The child with great interest turns his head to the source of sound vibrations, voice, or noise.

Development of speech function The development of communicative speech activity occurs with the development of sensory mechanisms of attention and associative areas of the cerebral cortex. Imitative sound reactions are already perfectly noticeable by 3 months. They are directly related to emotional arousal.

The manifestation of "humming" includes certain complex articulatory processes. The pronunciation of individual sounds gradually turns into lingering babble and imitation.

Physical achievements A child at 3 months perfectly holds his head in a prone position. He raises his neck and turns his head well in the direction of the object of interest to him. The kid leans on his hands and lifts the body above the surface.

There are attempts to roll over on its side and crawl forward. These are the beginnings of future crawling and active flips of the body through itself.

Fine motor skills A 3-month-old child actively puts his hands in his mouth, biting and chewing his fingers. He examines his face and feels his legs and nearby objects.

Everything that falls into his palm is immediately grasped by his fingers. The grip must be firm and secure. Some babies can already shift the object from one hand to another. The tactile perception of objects by touch is growing.

Communicative relationships and emotions The face of the mother and the closest people becomes the most preferred for the baby. Communication skills are influenced by a whole complex of multimodal information. For example sound (mother's voice); tactile (touch of the mother's hands), and olfactory (maternal smell).

The perception of the mother's negative emotion gives the infant a negative response. He screams, cries, and does not calm down for a long time. The child is more and more eager to communicate and play. The period of wakefulness is growing.

The child shows a serious breakthrough in development at 3 months. His physical, mental, and psycho-emotional achievements have no boundaries. All new skills, reactions, and learned habits of behavior are completely dependent on the amount of communication with the people around him.

The contribution to the development and health of a child of 3 months will affect his future success. The rudiments of speech and the formation of articulation skills will accelerate the development of the brain and enrich communications.

“It is better to consult a neurologist if at 3 months the child does not show an emotional reaction to the mother’s face! “

3 Month Old Baby Health

There are no boosters or new shots for 3-month-old infants. The baby may not give a sufficient protective reaction to viruses and infections that have invaded the body with a poorly developed immune memory. Toddlers can catch a cold, and get sick with herpes or flu viruses at this age.

Be more attentive to the sterility of dishes with artificial feeding. There is a risk of intestinal infection in case of non-compliance with elementary norms. It can be extremely dangerous for a baby at that age. Infants are prone to manifestations of diathesis. Mothers who are on natural breastfeeding should be more attentive to the diet. It is better to exclude active allergens from the menu.

Consult with an orthopedist if the child’s physical achievements do not match the established age norms. He will assess the need for a course in massage and physiotherapy.

Sleeping Schedules at 3 Month

A three-month-old baby still sleeps most of the day. It grows and develops when sleep, processing comprehensively perceived information about the outside world and interaction with it.

Sleep patterns should remain flexible. The schedule change is due only to force majeure or the natural restructuring of the baby’s biorhythms.

A 3-month-old baby should take about 6–6.5 hours of daytime sleep. You can distribute these periods of sleep as you like. It is better to build on the individual needs of your child. The schedule most often includes two longer periods of sleep (2 hours each) and two short ones (1–1.5 hours each).

8-10 hours for a night’s sleep stands out from the daily norm. The number of awakenings should be reduced (no more than 3 times per night).

3 Month Old Sleep

3 Month Old Sleep

Do not stop trying to introduce the regimen, regardless of the presence of sleep regression or the child’s illness. A free schedule is difficult to combine with the life of an adult. Sleep predictability will help you organize your schedule, and pay attention to other family members and yourself.

It is very important to adhere to the established age norms of sleep per day. This determines the correct development of the baby and the preservation of his physical and emotional health. Always observe your baby’s sleep hygiene. Keep bedding clean, diaper dry, bedtime rituals, silence, and darkness in the room. These simple rules are the key to sound sleep.

3 Month Old Feeding

The immaturity of the enzymatic system and intestinal motility does not allow a 3-month-old baby to eat anything other than mother’s milk. Only a professionally adapted mixture is acceptable that is easily absorbed by the baby’s digestive tract. A child within a day of 3 months should eat such a volume of milk that will be approximately 1/6 of his weight.

The intervals between meals at this age should be no more than 3.5 hours. Reduce the number of short breastfeeds. Feed your baby at night according to his needs. Many children do not wake up every 3-4 hours to eat. You don’t have to intentionally wake up your baby.

3 Month Old Baby Movements

The child’s mobility increases by 3 months. He manipulates his limbs well and actively. If he is placed vertically with his feet to the surface, he will try to push off from it. Motor reactions are an integral accompanying component of emotional manifestations. The kid spreads his arms and legs when frightened. He may cover his chest or face.

The child at 3 months rises leaning on the forearms. He holds his head upright well for 1 to 2 minutes without support. The child is already making half turns while lying on his back or stomach, which will later lead to a rollover. Don’t leave the baby alone.

Safety Around Child

A 3 month old baby spends most of the time lying down. Its activity is growing every day, which may not be safe. He learns to control his own body. The brain gives signals for making specific movements. They are stimulated by the need for cognitive activity.

Child safety

Especially dangerous for this age is to leave the baby alone. The child intensively practices the development of coups. The child may fall if left on a changing table or bed without sides.

It is very important not to give your child toys and objects with small parts. The baby now has well-developed motor skills and teeth are erupting deep inside the gums. The baby will pull everything into his mouth. This can lead to the ingestion of foreign objects.

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During sleepMake sure your baby is free while sleeping. Do not use heavy blankets. Do not place the baby on the stomach. Take time after feeding before going to bed and make sure the baby does not overeat.

During gamesDo not give your child toys with loose, metal, sharp, or small parts. Let the baby play and manipulate objects only under the supervision of an adult.

In the cribUse a crib with sides. Do not put large and soft objects inside it: pillows and large toys. Check the crib for any sharp edges or protruding screws.

In the strollerDo not wrap your baby more tightly than the weather requires. Remember that the stroller is another layer from the cold that creates its microclimate. Do not cover the stroller with a cover without ventilation windows.

During bathingDo not pour too much water into the bathroom. Always keep the baby’s head on the surface of the water. Do not overheat the water above 36°C. Do not leave your baby in the bathtub with younger children or unattended.

In the carTransport your child only while fastened in a car seat. Do not feed formula while the vehicle is moving. Adjust the air conditioning or climate control to an acceptable temperature in the cabin. Never leave a sleeping baby in a closed car.

What To Schedule Next

You can register your child in a kindergarten if you cannot temporarily leave your job and want to continue your professional activities. This is acceptable from 6 weeks after birth. We recommend staying close to your baby for at least the first six months of his life.

Following the vaccination plan should be repeated vaccinations against rotavirus, pertussis-diphtheria-tetanus, Hemophilus infection, pneumococcal (meningitis, pneumonia), and polio. Second doses against these diseases are administered at 4 months. Pre-register for these vaccines.

Don’t miss your mandatory pediatrician appointment at the end of the 3rd month. He will make control measurements of the main age parameters of growth and assess the level of development of the child.

Parents Tips and Development Speed Up

Protect your child from any potential dangers. He is unable to protect his life on his own. Don’t take advice from other moms. Be guided only by the authoritative opinions of experts and trusted sources of information. Replenish knowledge and skills in caring for a child.

  • First aid coursesTake a first aid course for your child. This is very important as the baby becomes too active. You will be taught how to perform artificial respiration, clear the airways of foreign objects, and dress wounds.
  • Walk more in the fresh airExpand the scope of your stay in the constant care of the baby. Take a walk in the park and talk to other moms. Daily walks in the fresh air should take at least 4 hours.
  • Long tripsTake a supply of food, hygiene products, diapers, and clothes for long trips with an infant. Do not leave your baby in a long, stationary position. Stop every 3 hours and take your child out of the car seat.

The baby will not develop properly without regular interaction with the external environment and communication. No super-innovative techniques are required. It is enough just to be constantly next to the child, talk to him and develop him physically. A child learns a lot on his own and imitates the adults around him.

5 Development speed ups

  1. Morning exercisesDo a morning set of flexion-extension exercises to strengthen muscles and ligaments.
  2. Hardening – Gradually reduce the temperature of the bathing water and arrange air baths.
  3. Training coups – Teach your baby to roll over by smoothly flipping his leg and turning his body.
  4. Communication – Talk to your child as equals. Read poems and sing songs.
  5. Visual reactions – Show bright pictures of different colors. Move objects closer and further away from your face.

Regular classes are not enough for the good development of the child. The mother must be always in a resource state. Do not forget that your bond with the baby remains extremely close. He can read any emotion. You are the whole world for him and exactly what you will be will determine the future attitude to life of your child.

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