Mommies, hello everyone! We've been at it for two months now, and today…

Mommies, hello everyone! We've been at it for two months now, and today our son flipped himself onto his belly ??? He was already rolling on his side, spinning, turning, but today he flipped onto his belly. He even tries to put his hands in his mouth, especially when I was putting him on his belly, his little fist started sucking. I understand that all babies are different, but is this almost two months old normal? ??