3 Months Old - Baby Growth, Development, Milestones & Activities

Your 3 Months Old Baby Growth and Development

Medically Reviewed By
Dr. Mahesh Patil (Paediatrician)
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Isn’t it a bit hard to believe that your tiny little baby is already three months old now? Single-handedly she has managed to transform your life and has given it a new meaning altogether. Not only is she growing at a rapid pace, but springs so many surprises every single day. You will be completely glued to every single milestone your little one achieves since it provides a reliable graph of your child’s growth. To understand infant development at 3 months in a better way, read on to find out the various parameters mentioned in this article.

Video: Your 3 Months Old Baby Growth and Development

Growth of Baby

At three months in her new world, your baby has now grown in length and seems larger too. Shopping for a larger size of baby clothes will become a priority for most mothers, as your visibly-round baby won’t seem to fit in new-born clothes anymore. Indian summers, however, can spare you these expenses as a nappy and a soft singlet can be the perfect attire for your baby. Remember that your baby will grow in weight and length, so make sure you use all those clothes you’ve bought instead of saving them for later.

3 month old baby growth

Baby Development

Below are some of the weekly developments your baby goes through:

12 Week Old Baby Development

Your 12 week old will be sleeping longer at a stretch up to 4 hours without waking up for feeding. The baby starts to get the difference between day and night, and sleeps more during the night while waking up once or twice for feeding. Her sleep pattern is changing slowly but surely. Her eyes will be well-coordinated, and she will fix her gaze over toys and the mother’s face, and depth perception will be better, too. She will enjoy watching her own hands. If your baby seems like she’s squinting, take your doctor’s advice, since it could mean vision issues later.

13 Week Old Baby Development 

Your baby’s vision is steadily improving, as does her perception of colour. It is also the right time to give your baby a whiff of fresh flowers or a sweet-smelling fruit. She will turn her head towards music and other interesting sounds. Her motor skills and hand-eye coordination will start to get better when she enters week 13. Shrieking sounds will be common at this stage, and you will often find your little one cooing to herself.

14 Week Old Baby Development

Your baby’s world is now at its fullest and most colourful glory, as she can now differentiate between hues and bold colours. Her world is suddenly a new one with fresh and vibrant colours being infused into it. She will begin to respond more enthusiastically to your presence in the room, and give a more pronounced reaction to your voice.

15 Week Old Baby Development

As the neck muscles grow stronger, the baby can holds her head upright, and look above when sleeping on her belly. Help your baby to strengthen these muscles by propping up pillows behind her, or by adopting a slightly-upright position in the stroller. Expect a few cries during the night when she attempts to roll over and gets stuck doing so. It is best to put your baby on her tummy as early as possible, so that she gets used to it.

Adorable three month old baby

Baby Health

Adults can always communicate with the doctor when they are afflicted with a disease. With a 3-month-old baby, this is obviously difficult. However, they have another way of communicating with people: crying. Always be on the lookout for unwarranted crying. If this is followed by weakness and reduced mobility, take the baby to a paediatrician immediately.

Baby Milestones – 3 Months

Your baby’s development at three months will revolve around three areas viz. physical, cognitive, and emotional. These milestones will signify the baby’s growth, and can be measured accordingly.

  • Improvement in gross motor skills: The baby will be able to lift her head up to a 45 degree angle, and the growing strength in the baby’s neck muscles allows her to lift her head when she is on her tummy.
  • Response to sounds: Your baby will start to turn her head towards a source of sound, which indicates that her audio senses are developing. Familiar sounds, like your voice or when the phone rings, will elicit such responses.
  • Increase in vocal communication: During this phase, the baby might squeal in pleasure, and make noises or babbles in response to what she hears. Although the babbling and actions will not resemble the real thing, this will be an important milestone for your baby.


Your bundle of joy will surely live up to this moniker at 3 months and announce her presence in the house with squeals and high-pitched sounds. Her sounds of delight will keep the entire household on its toes as she will try out newer (and not necessarily pleasant) vocal skills. Your baby may be slightly scared of her own voice, so ensure your feedback is a positive one that says those sounds are okay.

3 Months Old Baby Activities

If you want to know what activities to do when your baby is growing up, check the following ideas for a great time with your child:

  • Provide toys: Put your baby on her back or tummy and dangle toys over her head so that she can enjoy the colours and sounds. Place toys of different shapes in her hand so that she can learn to grip objects. Provide toys of colours that she can enjoy variety.
  • Practice head support: Put your baby on your lap in such a manner that she faces you, while ensuring enough support to her back and neck region. Attract her attention by making noises, giggling, and calling out to her, so she looks up to you.
  • Tummy time: Turn your baby onto her stomach, and place a few brightly coloured toys or objects in front of her and above her head. You can lie in front of her so that she lifts her head and upper body by using her arms to take a look at you. By doing so, you will help strengthen her neck muscles and upper body, and your bond, too!
  • Tracking toys: Put the baby on the floor and roll a ball or a toy car in front of her. This will encourage her to follow the toy and track its movement. Use a rattle to grab her attention if she doesn’t show any interest initially.
  • Using the baby’s name: Use your baby’s name as often as possible, as her name will be the first word she will connect to. Use it while singing songs and lullabies, and while having a conversation with her. While singing to her, vary your voice and pitch to keep her interested.

Mom playing with baby

3 Months Old Baby Care

Follow the below-mentioned tips to keep your infant healthy and safe during this period:

  • Breastfeeding is essential: Breast milk is the most important part of a baby’s diet, so make sure you continue breastfeeding your three-month-old. This will also help you create a feeding schedule. Avoid any kind of solid food, cow’s milk, or juice, as breast milk is the healthiest food for your little one.
  • Sleep is important: Your baby might be sleeping for 4 to 5 hours at a stretch. Do not rock her if she is going off to sleep on her own. She might get up a couple of times in the night, and may need to be fed to get to sleep. However, all babies have varying sleep patterns, and the routine of one baby can be completely different from another’s, due to reasons such as colic.
  • Communicate well: At three months, your baby’s responsiveness to sounds and gestures is high, and it will be more expressive, too. Use gestures to make your baby laugh, and smile and talk to her.
  • Use safety precautions: You will have to be extra careful regarding your baby’s safety now, since her movements and activities have increased.
  • Promote development changes: Many important development changes like drooling, chewing and sucking will occur during the third month. Use teethers to good effect here, since babies like to chomp on things, and it can be an amusement for them. Spend some time outdoors in the park to give her a taste of her surroundings.


By month three, you and your baby will have managed to create a fairly-settled feeding routine between yourselves. Your baby’s skills at feeding will have improved dramatically, and your ability, too, will have improved tremendously. As a mother, you will now be able to distinguish between your baby’s hunger cry and the cry that has boredom written all over it. Your baby’s sleep duration will increase, so you will find a bit of relief if you are breastfeeding. If your baby is bottle-fed, expect the sleeping hours to increase slightly earlier.


Typically, your 3-month-old will sleep for 14-15 hours in the day, which includes the short naps during the day and night-time sleep. Since night feeds have reduced to a minimum, expect your child to sleep for 4-5 hour stretches. This happens because your baby’s nervous system is maturing, which allows her stomach to accommodate a larger quantity of milk or baby food. However, don’t just expect her to sleep throughout the night just yet; you will still need to be available on-call for feeds a couple of times.

Tips for Parents

Parenting is a hands-on learning experience for most, although a bit of support from experienced and well-meaning friends and relatives is useful. Here are a few tips to go through this phase with ease:

  • Irrespective of all the advice you may hear, do not start with solids at this stage. Your baby should be at least 6 months old before you do it. Till that time, breast milk is the ideal food for your little one, as she receives all the necessary nourishment through it.
  • Create a routine of feeding, sleeping, and playtime with your baby. This ensures that your tiny tot will get used to a schedule, and will fall off to sleep at night without much of a fuss. 7 pm to 9 pm will be the ideal time for your baby to sleep, and this will encourage longer sleep durations during the night.
  • Get the baby’s check-up done, and schedule one for the next month as well.
  • Parents are often anxious about the ideal 3-month-old baby’s weight. Though your doctor will be the right person to speak to, if it’s a boy, he should weigh between 6 and 6.5 kg, while a baby girl should weigh between 5.5 to 5.8 kg.

It is important to understand that every baby will have her own development speed, and milestones may come early or late. Your apprehensions about your baby’s growth are justified, but can be easily put to rest. Keep a watch on the developments, and report any abnormal activity to your doctor, as that’s the best way of going forward.

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