A week ago Sarah only wanted to sit up and not lie down. The past couple of days have been all about doing push-ups! She can get moving backward quite a bit with these push-ups and I even saw her get on her hands and knees a couple of times. This is all happening three months earlier than Anna's schedule so I'm a little caught off guard. I also think this has been affecting her sleep the past couple of nights: she can't stop practicing these push-ups! I guess this means we are moving the crib mattress down just in case she decides to practice pulling up, too.