Silas is rolling over!

Well, Silas has been rolling over from tummy to back for awhile now. He does it pretty much every time I put him on his tummy on the floor, because he hates tummy time. He yells at me and cries but he rolls over. I did have him on my mattress yesterday and he was happy and rolled over 3 times in a row. I didn't catch it on video though. :( I think it was easier on the mattress.