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9 Month Old Baby: Development, Sleep and Milestones

All physiological parameters of the child undergo serious changes from the first month of life to 1 year. Blood parameters, the work of the cardiovascular system, digestion, respiration, etc. change with the growth and development of the child. Knowledge of these physiological parameters and the age-related characteristics of their changes is necessary for an adequate assessment of a child’s health.

Parents often do not have a sufficient knowledge base for proper control and care of the child. This leads to mistakes, some of which are difficult to fix. It is recommended to regularly replenish the information stock about the age stages of development.

We have selected the most relevant and important information for each month of a baby’s life. Let us consider in more detail the features of development and the main parameters of children of 9 months.

9 Month Baby Development

The development of a child of 9 months is accelerating. The kid reaches new heights in motor skills and abilities, he is much stronger. Now the child actively learns about the world through play and research activities. His body is gradually but surely moving forward towards its improvement.

Priorities, habits, biorhythms, and needs change in a baby at 9 months. Every day he grows up and remembers a huge amount of information.

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

A nine-month-old baby is getting a little closer to the upcoming walk. It builds muscle mass and strengthens the musculoskeletal system. The work of the digestive system stabilizes at this age. The organs of the gastrointestinal tract adapt to solid food. You can gradually expand the child’s diet.

There are changes in the structures of the brain and its functioning. Changes in visual perception are especially noticeable. The work of the excretory and hormonal systems is gradually getting better. The skeleton is getting stronger and teeth are actively erupting.

Brain – Improves transmission of nerve impulses. This is due to the myelination of nerve fibers. This process is already taking place in the anterior frontal areas of the cerebral cortex. The overall volume of the brain is growing.

Muscular frameMuscle mass increases. The coordination abilities of the muscles are strengthened. The child can strain the muscles well and resist them. Hips, shoulders, arms, and back muscles become much stronger.

Jaw and teethJaw muscles develop during active chewing. The second incisors appear at 9 months. The gums may become loose and painful. The secretion of saliva will increase. The location of the jaws changes and this affects the shape of the face.

Stomach and digestionThe cardiac sphincter is functionally incomplete. The stomach is still in a horizontal position. There is a growth of the bottom and the pyloric section. Hydrochloric acid is actively produced. Digestion is normalized. The gut is relatively stable but vulnerable.

Skin and subcutaneous fat layerThe mass of subcutaneous fat increases in proportion to the increase in the total body weight of the child. The main thermoregulatory reactions have been formed. Brown adipose tissue is active. The skin becomes stronger and thicker. The stratum corneum thickens.

Posture – The baby is already starting to stand up and try to walk. This significantly stretches his spine. The posture of the child is harmonized. The shoulders straighten, the stomach becomes smaller and the limbs noticeably lengthen. The back is straight and well-supported.

Your Baby Growth at 9 month

Important parameters for assessing the size of an infant are the circumference of the head and the circumference of the chest. The head circumference for girls will be 44 cm and for boys – 45.3 cm. Alignment of the size of the head and chest occurs at the age of nine months. The girth of the chest of girls of this age is 44 cm. For boys – 45 cm.

9 Month Old Baby Milestones

The spectrum of physical, mental, and emotional achievements is very wide in 9 months. This age can be called the “time to speak” period. The child is actively communicating. He uses speech as the main communication tool.

The variety of body movements becomes more and more deliberate, conscious, and coordinated. The kid no longer loses toys from his hands. He becomes very mobile and restless. Constantly spinning, moving the body, turning his head in the direction of new sounds. A child of 9 months has become much more difficult mentally. He shows character, protests, and even rebels.

Improvement of perception Shape recognition invariance is formed by the 9th month. The appearance of this feature shows that perception begins to depend less on the physical characteristics of the stimulus. The essential characteristics of the subject become more important.

There is an initial ability to group objects according to a varying attribute. The child can evaluate the form and determine it visually. Children begin to collect sorters with the simplest forms, large puzzles, and a pyramid.

Intonation-methodical imitation of speech Specific linguistic features inherent in the family appear in the process of communication with adults. Emotional communication with the child leads to progress in communication and understanding of speech.

Words for a baby are no longer just sounds. A baby at 9 months imitates speech and tone of voice. He paints his babble in shades of “indignation”, “joy”, and “surprise”.

Joint game activity Almost the entire cognitive process of a child of 9 months is reduced to a playful form. Now there is a steady interest in joint games. A kid can tease an adult, imitate him, and respond with an action to verbal instruction.

If the mother tells the baby to take a particular toy, he will take it. Babies of this age are good at gesturing goodbye. They wave their hands and treat it like a game.

Imitating learning mechanism 9 months is an active period for the implementation of the imitation mechanism. Mirror neurons play a key role in this. They are activated at the moment of independent actions. Attached attention is necessary to observe what the adult is doing. Its launch begins only with the direct participation of an adult.

This learning mechanism helps to master the actions in the process: hold a spoon, drink from a cup, comb your hair, clap your hands, etc.

Motor functions Children of this age are prone to conscious movements. Muscle tone is regulated, posture is controlled, and movements are coordinated. There is an interaction of visual reactions with motor ones. The child sees an object at an accessible distance and pulls his hand to it with controlled force.

Interaction with objects depends on their properties. The baby knows that the rattle rings when you shake it in your hands. The vertical position of the body, steps at the support, and crawling are practiced.

Visual and auditory perception Infants of this age become sensitive to more important characteristics of the object, downplaying the less important ones. Children recognize facial features and identify animals. The kid can imitate barking at the sight of a dog, indicating that he knows this animal.

The selective sensitivity to facial expressions and intonations in the voice of an adult is growing. A special “speech filter” is formed. The kid easily recognizes his native language and listens in surprise to speech in a foreign language.

Summarizing the key points of development, we can conclude that mental improvement is progressing and the visual parts of the brain are actively functioning. Relationships between orienting reactions and coordination of movements are being established.

The main physical achievement of the baby by 9 months is the vertical position of the body with the beginnings of the first steps. In cognitive activity – the implementation of learning mechanisms. The closeness of interaction with an adult is increasing and a huge amount of experience is accumulated, which the baby uses in understanding the world.

“Intensive development of speech or movements are the priorities of babies 9 months old. This path is genetically determined.”

9 Month Old Baby Health

The age of 9 months is a period of high risk of developing iron deficiency anemia. It is necessary to carefully monitor the nutrition of the baby during this period. Hemoglobin drops sharply with viral diseases, malnutrition, or a small number of walks in the fresh air.

This condition is manifested by the collapse of the child on its side when crawling, weakness, drowsiness, and pallor of the skin. It is necessary to immediately consult a doctor if an illness is detected. Iron preparations in a strictly controlled dose and nutritional correction will be prescribed.

It is recommended to introduce re-vaccinations at 9 months: Hep B, Hib, IPV. Practice using the Flu vaccine. Continued intake of vitamin D3, especially in regions with a small number of sunny days per year.

Sleeping Schedules at 9 Month

Almost nothing has changed in the sleep schedule. Sleep patterns remain the same. Babies are moving on to two naps at 9 months of age. Wake time is still increasing. Sleep becomes a little more stable and calm. The regime changes with minor shifts.

The daily norm of sleep remains within 13-15 hours. Sleep during the day is given 2.5-3 hours and at night – 8-10 hours. Awakening becomes earlier and suggests a morning nap. It can be short and take no more than 1 hour. The second nap comes at lunchtime. It lasts 1-2 hours. Rarely and not always there is a third nap lasting 20-30 minutes.

9 Month Old Sleep

9 Month Old Sleep

There can be no complete rejection of daytime sleep at 9 months. It is necessary to correct the situation as quickly as possible if such gaps appear in the schedule. Sleep regression often affects daytime sleep. Violations occur as a result of a strong jump in development or growth. Use a flexible schedule and bedtime rituals.

Nothing should disturb the baby so that he sleeps well. Keep track of his health and then it will be easier to maintain the stability of the schedule. Your baby is not required to sleep according to established standards. Sleep patterns are also individual.

9 Month Old Feeding

The need for breast milk or adapted formula at 9 months is still relevant. The child eats 5 times a day. Daily feedings can be replaced with complementary foods that need to be alternated. The intervals between meals are no more than 3.5 – 4 hours.

Babies 9 months old do not yet have chewing teeth, so all food should be finely chopped. The diet includes the same products as last month. The menu must necessarily contain fruit, vegetable, and meat purees, dairy products, and cereals without milk.

You can add low-fat varieties of sea fish to the diet at this age. Try a new dish with caution, watching for an allergic reaction. Snacks should not be a substitute for a full meal. Do not give your baby sweets and fresh pastries.

9 Month Old Baby Movements

The physical development of a 9-month-old baby is progressing noticeably. The child can crawl quickly in any direction. He climbs obstacles and can learn to get off the couch properly. The baby stands at the support independently taking this position. The child can take several steps while holding on to support. He opens lockers, and doors and pushes objects with his hands.

A nine-month-old baby can sit up from a lying position and lie down from a sitting position. He has developed a strong motor imitation. The child can raise his hands, clap his hands, and wave goodbye. Improved movement with small objects. The child can put shapes in the sorter and manipulate objects. All movements become more confident and purposeful.

Safety Around Child

A child of 9 months becomes more maneuverable and restless. It is constantly on the move, which increases the number of risks. Dangers lurk at every turn. Such physical activity requires especially increased attention from parents. The safe existence of the child is the main task of this age.

The kid can easily hurt himself with the growth of cognitive activity, curiosity, and mobility. He can put sharp objects in his mouth, choke, fall into the water, and get burned. The most common occurrence is a fall from a height. Now obstacles for a child are the most interesting attractions.

The task of parents is to provide a safe space for wakefulness. The kid will be able to find adventures everywhere, wherever you are with him.

2 Month Old Sleep

In the cribIt is better to sleep separately at 9 months. The crib should be protected by sides without wide openings so that the baby does not get out of it on his own. The sides must be high otherwise the child will fall out of the crib.

In a play area at homeAllocate maximum space for the play area. Use special barriers for crawling children. Do not leave the baby alone for a long time even in such a fence. Cover the floor with an insulating mat.

In the bathroomBathe your baby by holding it in your arms or using a swim ring. Don’t overdo the chemistry. Never leave an infant with older children during bath time. Control the water temperature.

Backyard – Always protect your baby from the sun. Wear a hat and cover your body. Use insect repellent. Keep your baby away from water and pools. Watch what he puts in his mouth.

In transportWear your seat belt on public transport and only sit in designated seats for mothers with children. Use a car seat in your car.

Windows/Doors/StairsPlace safety stops on all cabinets and doors. Install barriers at the entrance and exit of stairs. Remove handles from the chests of drawers and cabinets. Block access to areas with potential height hazards.

What To Schedule Next

Don’t forget to visit your pediatrician. Start looking for a kindergarten if your lifestyle requires it. Choose a place with good recommendations and closer to home. You can use the services of a private babysitter. Give preference to a specialist with experience and medical skills.

Plan your day to match your child’s schedule. You can attend joint mother coaches, developing classes, swimming pool, and massage so that time does not seem like a monotonous routine to you. Make an appointment with a narrow specialist: a surgeon, a neurologist, a gastroenterologist, or a cardiologist if you have problems with your child’s health.

Parents Tips and Development Speed Up

Always keep an eye on your baby’s development. Each new age stage entails a change in care and special attention to specific details. Use the advice that is appropriate for your child’s developmental level and age. Do not try to get ahead of events and rush the emergence of new skills.

  • Place your child on the pottyThis can be started as soon as the baby sat down well. Do it without coercion and gadgets. It is necessary to develop an association of defecation with sitting on the potty.
  • Teach self-relianceTeach your child to have fun alone, hold a spoon, and drink from a mug. Don’t help him where he can already do it on his own. Let the baby spend some time in communication with himself.
  • Don’t sit at homeThis is harmful both for your psyche and for the health of the child. Walk more. Expand your social circle, and show your baby the outside world and not just the walls of your home.

Focus on the activities that are most interesting to the child right now. Don’t forget about all-around development. The kid should know and be able to do everything available at his age. Explore different developmental methods and select a few that are most suitable for your baby.

5 Development speed ups

  1. Physical educationDo exercises in the morning. Allow your child to overcome obstacles.
  2. Mental development – Read stories with pictures. Using learning cards. Learn colors and animals.
  3. Fine motor skillsStimulate the work of the fingers: use paints, and kinetic sand only under supervision.
  4. Development of speech – Comment on everything you do and give your child simple speech tasks.
  5. Emotions Speak negative emotions out loud: “you are upset”, “you are offended”, etc.

The child achieved tremendous success in communications at 9 months. Do not limit his communication only to family members. Let the baby join society. The sooner he starts practicing, the fewer problems there will be in the future. The development of the child should be aimed at ensuring that the baby receives and processes as much information as possible and retains it in his memory.

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