Sits without support

What is this milestone?

Can sit independently

Your baby can now sit upright completely on their own, without needing to lean on their hands or be propped up by cushions. They can balance while turning their head to look around.

Why it matters

Independent sitting is a monumental shift. It frees up both of their hands to grasp, transfer, and manipulate objects, rapidly accelerating their fine motor skills and cognitive exploration. It also helps with eating: CDC lists sitting up — alone *or with support* — as one of several signs a baby may be ready for solid foods, alongside head and neck control, opening their mouth for food, and swallowing rather than pushing food back out. It is one sign among several, not a prerequisite, and your pediatrician is the one to ask about your baby.

What to expect leading up to it

The transition from supported to independent sitting is gradual. They will spend less time in the 'tripod' stance and more time sitting straight up. Be prepared for them to suddenly topple over sideways or backward as they test their limits.

How to encourage and support it

Create a soft landing zone with blankets or a padded play mat. Place toys slightly out of reach to encourage them to pivot their torso, which further strengthens their core and balance.

When to talk to your doctor

The CDC's milestone checklists say what most children (75% or more) can do by each age. They list “Sits without support” by 9 months. If your child is not doing this by then, the CDC's advice is not to wait: talk with your child's doctor, share your concerns, and ask about developmental screening. The same goes at any age if your child loses a skill they once had, or if anything else about their development worries you. Source: the CDC's “Learn the Signs. Act Early.” milestone checklists, checked October 5, 2026.

CDC: Milestones by 9 months · CDC: all milestone checklists