What Should My Baby Be Doing at 3 Months?

By 3 months, most babies can smile at people, coo, hold their head up without support, and follow moving objects with their eyes.

You’ve been home for a couple of months now, and the sleep fog is starting to lift just enough to wonder: is my baby hitting the right marks? Between the endless feedings and diaper changes, 3-month-old development can feel like a blur of coos and little movements that are easy to dismiss as random.

The honest answer is that a 3-month-old has a lot going on socially, physically, and cognitively. Most of what you’re seeing — the smiles, the gurgles, the way their eyes track a toy — is exactly on track.

Why Milestones Feel So High-Stakes Right Now

At around 3 months, babies shift from being mostly reactive to starting to engage. That first real social smile feels huge because it’s the first two-way interaction you get. It’s also when parents start comparing notes and wondering if their baby is “behind.”

Here’s what the CDC considers typical for a 3-month-old — remembering that these are things most babies (75% or more) can do by now, not an all-or-nothing checklist.

• Social smiles: Your baby may smile at you when you walk into the room or when you smile back. Some babies also start copying facial expressions, like opening their mouth wide.
• Cooing and gurgling: Those soft vowel sounds are the beginning of babbling. Many babies also turn toward a familiar voice and quiet down when spoken to.
• Head control on tummy: While on their belly, a 3-month-old can usually lift and hold their head up without needing support.
• Eye tracking: A baby at this age will follow a moving object — like a rattle or your face — with their eyes. They also start to recognize familiar people from across the room.
• Hand-to-mouth action: Bringing hands to the mouth, opening and shutting fists, and swiping at dangling toys are all common motor skills at 3 months.

Each baby develops at their own pace, so seeing one or two of these slightly later than another baby is rarely a concern.

The Key Milestones in Social, Motor, and Communication Skills

The CDC puts together a checklist that breaks down development into four categories: social/emotional, language/communication, cognitive, and physical. At 3 months, the social piece — smiling at people — is often the first big one parents notice.

On the communication side, a 3-month-old typically begins to coo and make gurgling sounds, and may even “talk back” with soft coos when you talk to them. This back-and-forth is the foundation of early language. The CDC developmental milestones definition considers these milestones things 75% of children can do by a given age, so individual timing varies.

Cognitively, babies start following moving objects with their eyes and recognizing familiar people at a distance. They also may begin to tell colors apart — a skill that continues to sharpen over the next couple of months.

These categories overlap a lot — a baby who smiles also tends to make eye contact, and a baby who tracks objects is simultaneously building neck strength during tummy time. Development is more of a web than a straight line.

Red Flags Worth Mentioning to Your Pediatrician

Every baby hits milestones at their own speed, but there are a few signs at 3 months that may warrant a conversation with your doctor. The CDC lists these as red flags:

• Doesn’t smile at people — lack of social smiling by 3 months can be a sign to check in.
• Doesn’t follow moving objects with their eyes — vision and tracking are developing fast at this age.
• Doesn’t hold head up when on tummy — difficulty with neck control might mean muscles need extra support or evaluation.
• Doesn’t respond to loud sounds — hearing screening is standard at birth, but if you notice no reaction, it’s worth verifying.
• Keeps hands fisted or doesn’t bring them to mouth — lack of hand movement can be subtle but worth flagging.

These are screening indicators, not a diagnosis. If you notice one or two, it doesn’t mean something is wrong — it just means a quick call to your pediatrician can give you peace of mind.

How You Can Support Your 3-Month-Old’s Development

You don’t need fancy toys or apps to help your baby grow. Simple, everyday interactions do most of the work. The American Academy of Pediatrics recommends about 30 to 60 minutes of tummy time per day by 3 months, broken into short sessions of a few minutes each.

Other helpful activities include:

1. Talk and sing to your baby — they respond to the rhythm and tone of your voice, which builds early language pathways.
2. Offer high-contrast toys or books — black-and-white patterns and bold colors are easier for a 3-month-old’s developing vision. Mayo Clinic notes that infants may begin telling colors apart around this age, so simple, colorful objects can catch their attention.
3. Practice reaching and grasping — dangle a soft rattle or toy near their hand and let them swipe; it strengthens hand-eye coordination.
4. Use mirrors — propping a safe, unbreakable mirror near them during tummy time encourages head lifting and self-awareness.

All of these activities are low-pressure — even a few minutes of focused interaction spread throughout the day adds up.

The Bottom Line

At 3 months, most babies are smiling, cooing, gaining head control, and starting to track the world around them. If your baby is doing even a few of these things, they’re likely developing right on track. The red flags are few and are meant to prompt a conversation, not panic.

For specific concerns about your baby’s motor skills, vision, or social engagement, your pediatrician can do a quick developmental screening and offer tailored guidance for the weeks ahead.