By 4 months, most babies can hold their head steady, are starting to reach for objects, and are becoming noticeably more social, cooing, smiling, and even laughing. It’s a big developmental window, and knowing what to look for helps you appreciate what’s unfolding and spot anything worth mentioning to your pediatrician.
Head Control and Movement
The most visible physical milestone at 4 months is steady head control. When you hold your baby upright, their head should stay centered without wobbling. During tummy time, a 4-month-old can typically push up onto their forearms, lifting their head and chest off the floor. Some babies begin rolling from tummy to back around this age, though many won’t get there for another month or two.
You’ll also notice your baby kicking more forcefully when lying on their back and bearing some weight through their legs when you hold them in a standing position on your lap. These movements build the core and leg strength they’ll need for sitting and eventually crawling.
Tummy time is still important at this stage. The NIH recommends working up from short sessions of 3 to 5 minutes to longer, more regular stretches throughout the day. By 2 months, the goal is 15 to 30 minutes of total tummy time daily, so by 4 months your baby should be comfortably tolerating sessions that add up to at least that much.
Reaching, Grabbing, and Hand-Eye Coordination
Around 3 to 4 months, babies start tracking moving objects with their eyes and reaching for things. This is the beginning of hand-eye coordination. Your baby may swipe at a dangling toy, bring both hands together over their chest, or grab a rattle and hold it briefly. They’ll also start bringing objects (and their own hands) to their mouth, which is how they explore texture and shape at this age.
Toys and objects placed about 8 to 12 inches from your baby’s face are easiest for them to focus on and reach for. High-contrast toys or anything that makes a gentle noise will hold their attention longest.
Sounds, Smiling, and Social Skills
Four months is when babies get genuinely fun to interact with. Your baby will smile at you and wait for a response, then smile again. They may imitate facial expressions, like sticking out their tongue when you do. Laughter often appears around this age, sometimes triggered by surprising sounds or peek-a-boo.
Vocally, your baby is moving beyond simple crying. They’re making cooing sounds like “ooh” and “aah,” experimenting with sounds made by pressing their lips together, and may start stringing vowel sounds into longer stretches of babbling. Crying is still their primary communication tool, but the range of noises is expanding quickly.
Babies at this age also respond to your tone of voice. A sharp or raised voice may make them cry, while a playful, high-pitched tone can produce excited gurgling. They’re not understanding words yet, but they’re reading emotional cues with surprising accuracy.
Vision and Awareness
A 4-month-old’s vision has sharpened considerably since birth. They can follow a moving object smoothly from side to side, and their color vision is maturing. You’ll notice your baby scanning a room when brought into a new environment, watching faces intently, and turning toward sounds. They’re also beginning to recognize familiar people from across a room, not just up close.
This growing awareness means your baby may start showing preferences. They might light up when a favorite person enters the room or become fascinated by a pet moving across the floor. They’re processing their environment in a way that looks, for the first time, genuinely curious.
Sleep Patterns at 4 Months
Most babies this age need 12 to 16 hours of total sleep per day. That typically breaks down into a longer nighttime stretch plus at least two daytime naps, with daytime sleep totaling about 3 to 4 hours. By 6 months, many babies sleep 9 hours or longer at night with only brief awakenings, but at 4 months you may still be dealing with one or two nighttime feedings.
This is also the age when many parents notice a shift in sleep quality, sometimes called the “4-month sleep regression.” Babies who previously slept well may start waking more frequently as their sleep cycles mature. This is normal and temporary, though it rarely feels that way at 3 a.m.
How Much and How Often to Feed
Whether breastfed or formula-fed, a 4-month-old typically takes in 24 to 30 ounces of milk per day, spread across multiple feedings of about 3 to 4 ounces each. Interestingly, babies consume roughly the same total volume per day from about 4 weeks through 6 months. What changes is the pattern: feedings become less frequent but larger as your baby grows.
Most 4-month-olds are still exclusively on breast milk or formula. While some parents wonder about starting solid foods, major pediatric guidelines recommend waiting until around 6 months, when babies can sit with support and show interest in food.
Signs Worth Raising With Your Pediatrician
Every baby develops on their own timeline, and there’s a wide range of normal. That said, certain patterns are worth bringing up at your next visit. If your baby doesn’t follow moving objects with their eyes, doesn’t smile at people, can’t hold their head steady when held upright, doesn’t make cooing or babbling sounds, or shows no interest in reaching for nearby objects, mention it to your pediatrician.
Losing a skill your baby previously had is also worth flagging. A baby who was cooing regularly but has gone quiet, or who could hold their head up but now seems floppy, should be evaluated. Early intervention programs exist in every U.S. state and territory, and the earlier a delay is identified, the more effective support tends to be. Your pediatrician can refer you to a developmental specialist if screening suggests it’s warranted.