Four months old

Colin was four months old yesterday. He unofficially measures about 25 inches, so he has grown about an inch since last month. Here are a few of the things he is doing now:

• making bubbles with his mouth;
• vocalizing a lot and laughing;
• standing for a few seconds with assistance before getting tired;
• sitting in the walker and enjoying it;
• starting to drool; and
• enjoying a bit of rough play like doing back flips on the bed, being tossed in the air, and bouncing quickly on a leg.