Too Big, Too Fast

My little Jason is already 4 1/2 months old! Where has the last couple of months gone? I feel like we just brought him home. He weighs a whopping 13 pounds and is 24 inches long. He loves his tummy time and can now roll over from his tummy to his back, but I haven't seen it yet!! He goes to sleep on his stomach (I know, his pediatrician would kill me) and when he wakes up he is on his back. The little stinker always does it when we aren't in the room. He is super ticklish and full of giggles. He loves his big brother. Whenever Josh walks in the room he lights up and is all smiles. It is really cute!!