It finally stopped at 12 lbs 15.05 oz! Maggie has gained 3 lbs 14 oz since she was born one month ago today. Since that seemed like a lot to me I googled "infant weight gain" to see what the average was. Most of the sites I found said that babies generally gain 4-7 oz a week for the first month and 1-2 lbs a month for the first six months. So it is a little more than average!
Because she also has pretty good head control (she can raise her head 90 degrees when she's on her stomach and is constantly pushing back away from my hand, supporting her head on her own trying to look around) and is so big most people who ask are really surprised when they hear how old she is. She's already taking after her big sister!