Can a 5 month old baby sit? Some babies can balance briefly or sit with support at this age, while many still need plenty of help. Both experiences can be normal because sitting develops gradually through stronger head control, balance, and trunk stability. This guide explains the signs that your baby may be ready for supported sitting, safe ways to practise, and when independent sitting usually develops. You’ll also learn why supervised floor play and tummy time matter, which warning signs deserve medical advice, and why sitting ability alone does not mean your baby is ready for solid food or seated sleep.