Question : My baby is 4 months old still can not face down over itself and hold his head. When babies can sleep on stomach?

Answer :

Babies begin to roll to his stomach in the range of 2-6 months.

It greatly affects the weight factor. Babies who are active with light weight will roll faster than a calm babies with heavy weight will be slower to get rolling into the prone position.

So do not worry about your baby's development.