Your 3-Month-Old: Development, Sleep and Feeding
By the Growbaby team · Published Aug 3, 2026
Written against AAP, CDC and WHO guidance. How we write these guides
At a glance
- Hands become fascinating: batting, grabbing and mouthing everything within reach.
- Night sleep often consolidates into longer stretches; total sleep runs roughly 14 to 16 hours.
- Wake windows stretch toward roughly 75 minutes to 2 hours.
- Cooing turns into squeals, early laughs and real back-and-forth chatter.
- The intense evening crying of the 2-month peak usually starts easing now.
Month three is when the fog starts lifting for many families. The crying peak is usually behind you, one feed-wake-sleep rhythm begins to repeat, and your baby becomes noticeably more social: studying faces, chatting back in coos and squeals, maybe surprising you with a first laugh.
Development-wise, this month belongs to the hands. Your baby discovers them, stares at them, and starts using them on purpose, batting at toys and bringing everything to the mouth.
Development at 3 months
Head control is visibly stronger: in tummy time many babies now prop on their forearms and hold the head up steadily. Movements smooth out from newborn jerkiness into something more deliberate, and swiping at dangling toys begins.
Socially, expect more eye contact, recognition of familiar people, cooing conversations and, for some babies, the first laugh. Answering their sounds, narrating your day and reading aloud are the highest-value play there is right now.
- Steady head control in supported positions and tummy time
- Bats at and briefly grasps toys; hands to mouth constantly
- Coos, squeals, may laugh out loud
- Recognizes familiar faces and enjoys social play
Sleep at 3 months
Many 3-month-olds sleep roughly 14 to 16 hours a day, and the night portion starts consolidating: stretches of 5 to 6 hours are common, and some babies do more. Naps are usually still 3 to 5 per day and can be short; that is normal at this age.
Wake windows typically run from about 75 minutes up to 2 hours. A consistent bedtime routine matters more every week now, because your baby is starting to connect the dots between cues and sleep. Keep every sleep on the back, on a firm flat empty surface, and hold off on sleep training conversations until after 4 months and a chat with your pediatrician.
Feeding at 3 months
Feeds usually become faster and more organized, commonly 6 to 8 per day for breastfed babies. A 3-month growth spurt can briefly crank the frequency back up.
Solid food is still months away: current guidance is to start solids around 6 months, when your baby shows readiness signs. Milk, breast or formula, remains the whole menu for now.
Fussing, soothing and the easing of the peak
For most babies the crying curve is now bending downward, though an evening fussy window can persist. By this age you usually know your baby's preferred soothing stack: motion, sucking, a particular hold, sound.
Growbaby keeps earning its place here: the soothing engine adapts the soundscape to your baby in the moment, and because it fades out as your baby settles, you are not sneaking over to switch anything off. Growy, the in-app assistant, also knows your baby's age, so its suggestions match this exact stage rather than a generic newborn.
When to check with your pediatrician
Mention it to your pediatrician if by the end of month three your baby does not respond to loud sounds, does not watch faces or follow moving objects, does not smile at people, cannot hold the head up in supported positions, or does not notice their own hands. None of these alone is a diagnosis; they are conversation starters with the person who knows your baby's whole picture.
Growing with your baby, week by week
Growbaby adapts to your baby's age: soothing that reacts to crying in real time, sleep routines for this exact stage, and Growy, an assistant that remembers your child. One subscription covers the whole family.
Frequently asked questions
How much should a 3-month-old sleep?
Roughly 14 to 16 hours per day is typical, with night sleep consolidating into longer stretches, often 5 to 6 hours, plus 3 to 5 daytime naps. Short naps are still normal at this age.
Can a 3-month-old sleep through the night?
Some 3-month-olds manage 6 hours or more at night, many do not, and both are normal. Most babies this age still need at least one night feed. Formal sleep training is generally discussed from around 4 months onward with your pediatrician.
When should I worry about milestones at 3 months?
Talk to your pediatrician if your baby does not react to loud sounds, does not watch or smile at faces, or has persistently poor head control. Babies vary widely, and the checkup schedule exists exactly to catch and contextualize these things.
When do babies start laughing?
First laughs commonly appear between 3 and 4 months, usually during social play. If your baby coos and smiles but has not laughed yet, that is well within normal.
Sources
This guide is for general informational purposes only. Growbaby is not a medical device and does not provide medical advice, diagnosis or treatment. Every baby develops at their own pace; for any question or concern about your baby's health or development, always consult your pediatrician or another qualified healthcare provider.