Kristen, I honeslty believe you have nothing to worry about. Mason is 4 whole weeks older than Mia and he doesnt roll either! He HATES tummy time, and wont even stay there for 2 seconds these days. He will not get up on all fours or anything alike.

Some babies are just different babe. Plus Mason only started sitting last week!

I am sure Mia will learn to do things in her own time.