What Should A Baby Be Doing At 3 Months?

At 3 months, most babies smile at people, coo and gurgle, follow moving objects, and push up on their arms during tummy time.

The newborn fog is lifting. Your baby is staying awake longer, more alert, and starting to react to your face and voice in ways that feel like real conversation. It’s an exciting shift, but it naturally raises a question for most parents: what should a baby be doing at 3 months?

The answer covers several categories—physical movement, social smiles, early communication, and cognitive awareness. While every baby develops at their own pace, pediatricians and groups like the CDC and AAP have identified clear milestones most infants reach around this age. Knowing them can help you celebrate the wins and spot when it might be wise to check in with your pediatrician.

Social Smiles and Emotional Connections

One of the most rewarding changes at three months is the way babies begin to engage socially. The CDC notes that by this age, a baby typically smiles at people when they hear a familiar voice. These aren’t just early gas smiles anymore—they are intentional reactions to you.

You might also notice your baby starting to copy facial expressions. Open your mouth wide or give a big smile, and watch closely—some three-month-olds will try to mirror the movement. The Mayo Clinic describes this early imitation as a key social milestone that builds the foundation for later interaction.

Babies also begin to express new emotions at this stage. They may calm down when they hear your voice or stop crying when picked up. A sense of trust and security is developing, and interaction becomes a central part of their daily rhythm.

Why the “Checklist” Mindset Can Help

It’s easy to read a milestone list and feel a little anxious if your baby isn’t checking every box perfectly. That’s completely normal. The purpose of knowing these benchmarks isn’t to compare your baby to someone else’s—it’s to give you a general sense of whether development is on track and to reassure you when things are going well.

• Cooing and gurgling: By three months, babies typically start making vowel sounds like “oooh” and “aaah.” The AAP suggests this is their way of “talking back” when you speak to them.
• Turns head toward sound: Your baby is becoming more aware of their environment. They should turn their head in the direction of a sudden noise or your voice.
• Follows moving objects: Tracking a toy or your face as you move across the room is a big cognitive step. It shows their visual coordination is strengthening.
• Holds head up on tummy: Tummy time is starting to pay off. Most three-month-olds can push up on their forearms and hold their head up for short periods.
• Brings hands to mouth: Hand-to-mouth activity is a sign of growing body awareness. Babies often use this as a way to self-soothe.

Seeing your baby hit these markers is a great sign that their nervous system and muscles are developing as expected. If some of these are taking a little longer, it’s usually not a cause for alarm—babies reach milestones on their own schedule. But having a checklist gives you a useful framework to talk to your doctor if something feels off.

Physical Skills and Baby Doing Activities

The physical changes between two and three months are noticeable. While a newborn is mostly curled up, a three-month-old is starting to uncurl and test their strength. Making eye contact is a big milestone—your baby will hold your gaze for longer stretches, which supports bonding and attachment.

At this age, babies can hold their head steady when held upright, and they have more control over their hands. They open and shut their fingers, swipe at dangling toys, and bat at toys placed within reach. The AAP notes that these movements are the foundation for later skills like grasping and reaching.

Legs get in on the action too. When lying on their back, many three-month-olds kick their legs vigorously or pedal them like a bicycle. WebMD describes this stage as one where baby enjoys playing with people, often adding arm and leg movements to the interaction.

When to Pause and Check In

Milestone checklists are useful, but they also serve a second purpose: catching potential delays early. The CDC and other health organizations have identified a few red flags at this age that warrant a conversation with your pediatrician, rather than waiting for the next well-child visit.

1. Doesn’t smile at people: A complete lack of social smiling by three months is a signal worth talking about.
2. Doesn’t follow moving objects: If your baby doesn’t track your face or a toy with their eyes, their vision or cognitive development may need assessment.
3. Doesn’t respond to sounds: Failing to startle at loud noises or turn toward your voice could indicate a hearing concern worth exploring.
4. Doesn’t bring hands to mouth: Limited hand-to-mouth activity can sometimes point to a motor delay that a specialist can evaluate.

Remember, missing one or two of these doesn’t automatically mean there is a problem. Babies have uneven spurts of growth. But if you’re feeling uneasy, or if your baby seems to be missing several milestones, trust your gut. Pediatricians see hundreds of babies and can quickly tell you if things fall within the wide range of normal development.

Supporting Your Baby’s Growth

You don’t need expensive toys or classes to support a three-month-old’s development. The most effective tools are your voice, your face, and a safe space to move. The AAP encourages parents to talk, sing, and read to their baby every day. Your voice is their first and most important language lesson.

Tummy time remains essential at this stage. Several short sessions each day—spread out so your baby stays happy—help strengthen the neck, shoulder, and arm muscles needed for rolling over and sitting up. A safe play mat with a few high-contrast toys can encourage them to practice lifting their head.

Cleveland Clinic’s guide on baby milestones emphasizes that responding to your baby’s cues builds confidence. When they coo, coo back. When they bats at toys, hand it to them. These small interactions are the building blocks of secure attachment. If concerns arise, the CDC recommends you consult a healthcare provider for a professional evaluation—early intervention, when needed, can make a significant difference.

The Bottom Line

Three months is a time of rapid social and physical growth. Most babies are smiling, cooing, tracking objects, and building head control and hand coordination. Knowing these milestones helps you enjoy the process and identifies when a chat with your pediatrician might be helpful.

Your pediatrician or family doctor has seen it all—they can reassure you about what’s normal and, if needed, connect you with early intervention resources tailored to your baby’s specific developmental path.