what can I do for my babies overall development . he is 5.5 months now.

A. hi dear Five-month-old babies can sit upright for longer periods of time. Your baby probably still needs to be propped up with a pillow or Boppy, but they may also be able to sit unsupported for a few seconds at a time. Some 5-month-olds can start rolling over from their back to their tummy.