How sitting develops
Babies first learn to hold their heads up on their stomachs, then to push up on their arms. When they first sit, they often lean forward on straight arms.
Those two ages measure slightly different things. The AAP describes when babies can stay upright, and the CDC describes what most babies do by their 9 month checkpoint.
Even when they can sit, babies may topple over. They usually catch themselves with their arms, and soon start leaning over to reach for things.
What can help
To let your baby practice, hold them upright or support their back with pillows. Put interesting toys in front of them, and keep anything they could choke on out of reach.
When to ask
The AAP says to let your pediatrician know if your baby isn’t sitting by themselves by 9 months.
Sources
- AAP (HealthyChildren.org): Movement Milestones: Babies 4 to 7 Months
- AAP (HealthyChildren.org): Movement Milestones in Babies 8 to 12 Months Old
- CDC: Learn the Signs. Act Early. Milestones
This guide is for information only and is based on CDC and AAP guidance. It isn’t medical advice and doesn’t replace a doctor. Guidance can differ between countries, so follow your doctor’s advice and your local health service. If you have any concern about your baby’s health, always contact your doctor. In an emergency, call your local emergency number. Babies develop at their own pace. If you’re worried about your baby’s development, contact your pediatrician.