As your baby turns four months old, they are likely making their personality—and opinions!—known to you. And there is no sweeter way to know you are doing the right thing than a baby's smile or laugh. Still, it is helpful to have a baseline understanding of four-month-old milestones. Then you can track progress and consult with your pediatrician if you have any questions or concerns.As your baby eagerly observes and works on engaging with the world around them, you can support them with some thoughtful play activities and plenty of love. They are learning constantly—whether you two are on a walk around the block, snuggling up at bedtime or reading together.

Four-month-old baby milestones

As your baby emerges from the fourth trimester, they may seem more ready to engage with the world.

Here's what to expect with your four-month-old baby milestones.

Senses:

  • Your baby knows the difference between tones of voice—which is why they react one way when you speak in soothing, calming tones and another way when there are surprising noises.
  • Your baby's vision has improved to about 20/40 and they are able to better distinguish colors. Their eye coordination has also improved, so bring it up with their doctor if they still seem unable to focus on objects within close range or cross their eyes.

Gross Motor:

  • At four-months-old many babies are working on (or already quite good at!) rolling over. Babies generally roll from stomach to back first.
  • With good head control and improving trunk strength, your baby should be able to sit with support.

Fine Motor:

  • Your baby has gotten pretty good at grabbing and picking up objects—although they won't use the more advanced pincer grasp for another few months.
  • Your baby has better control and coordination over their hands.

How to support your four-month-old baby’s development this month

Up for a little homework assignment, mama? Here are some four months old baby activities to support your cutie's development.

  • Soothe your four-month-old baby by responding to their emotions rather than always trying to dismiss or distract them.
  • Play with your four-month-old baby by putting some objects just beyond their reach during tummy time. This can help motivate them to roll and eventually crawl.

Engage your four-month-old baby's senses with multisensorial toys that use sounds, colors and textures—like the Glow and Discover Light Bar.

It’s science: Your baby knows what your hug means

Like a language without words, your baby is getting a loud and clear message when you hug them—even as young as four months old. As researchers have shown, babies know the difference between a comforting hug and just being held to be carried or fed. Why does that matter to you? Babies who feel loved and supported also benefit cognitively and developmentally.


As your baby turns four months old, they are likely making their personality—and opinions!—known to you. And there is no sweeter way to know you are doing the right thing than a baby's smile or laugh. Still, it is helpful to have a baseline understanding of four-month-old milestones. Then you can track progress and consult with your pediatrician if you have any questions or concerns.As your baby eagerly observes and works on engaging with the world around them, you can support them with some thoughtful play activities and plenty of love. They are learning constantly—whether you two are on a walk around the block, snuggling up at bedtime or reading together

When you're talking about your baby's developmental milestones, it's natural to talk about the love and care they feel in the same breath. So, yes, working on tummy time, reading books and singing songs can all do wonders for your four-month-old's development—but be sure you fill in with a lot of snuggles, too.

Four-month-old baby 101: