Mason started to smile a week or so ago. At first I wasn't sure if it was a fluke or not, but now there's no denying it. He is such a happy little boy and loves to smile for mom and dad. I still can't believe how fast he is changing. He weighs 11 lbs 5 oz and will soon be in 6 months clothes! My guess is by March. Up until 6 months of age a baby gains 1 lb every 2 weeks. I'm curious what the growth rate is after that.