We've been working on tummy time with Cole. He's getting so much stronger. I sort of felt bad placing him on his tummy because he just sat there face down with little to no motion. We worked on his strength by pushing up on my chest. He'd lift his head to follow my voice. It must have helped because in the last two weeks he's gotten much stronger and a lot better at pushing up on his hands. He prefers to rest on his whale when he's on his tummy, but doesn't object to laying flat on the floor too. It really helps with his gas too!