There are big changes in store for your baby at this age, all of which will help him to become a little more independent. Instead of just lying in one position, he will now be able to roll over and sit up to observe and interact with the world around him. The milestones that your child is likely to achieve between four and seven months include:

Passing a block from one hand to the other

Reaching for things

Looking for objects that you drop

Imitating many speech sounds

Turning toward a voice

Talking in single syllables

Rolling over

Sitting without support

He also should be able to hold his head steady if you pull him up by his arms to a sitting position. And he may be able to stand by holding on to things, put syllables together, and say “dada” and “mama,” although those words won't be used as a label for you or his mother.