The good news - she is growing like a weed, and has almost caught up developmentally.
Her length puts her in the 50-75 percentile - a very average little girl. Her weight, however, only puts her in the 10%, so she's still pretty small. The doctor isn't worried, though, because she is gaining and falls within normal parameters.
Developmentally she can do almost everything a normal 4 month old can do. The only thing she's a little behind in is muscle control. She should be pushing up on her arms more than she does. Again, no worries, she's just a little slower than average for now.
The doctor is going to try and get us insurance approval to put her on an antibody treatment for RSV. Apparently it's very expensive - basically unaffordable unless insurance will cover it. It consists of monthly shots of antibodies to help her body fight against a specific respiratory infection called RSV. Only at risk babies are offered these shots - at risk is premies, low birth weight and kids with heart/lung problems. Since we have no other children, and Kendra's not in day care or regularly exposed to other kids, she only hits a few of the "at-risk" criteria. We'll see, I guess.