When do babies sit up?

Written by Yuppo Lab Experts.

Updated 27 October 2026

Sitting is a baby holding themselves upright, first with support and then on their own. The CDC lists sitting without support as a milestone by 9 months; many babies sit with a little help from around 6 months.

What you can do

  • Practise on the floor with cushions around your baby.
  • Place toys in front and to the sides to encourage balance.
  • Keep up tummy time to strengthen the core.

When to talk to your doctor

Talk to your doctor if your baby cannot sit without support by 9 months, or seems very floppy or stiff.

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