Baby on the Move?

Jas • 2017 will be a better year! Working to make my hubby and son proud! #72915

My son will be 4 months on Nov 29th. The past 2 weeks I've noticed that when I have my so doing tummy time on top of me, he tries to push himself up higher on my body, as if he's trying to get to my face.

What's that about? My son pushing himself up my body?