Colby will be 6 months old in 2 weeks, and he's 54 lbs. He's huge. His daddy was big, so I'm sure he's going to be a big boy. When we had Cadence, she was smaller than I expected. Her top weight was 47 lbs. She died at 18 months, and had dropped to 43 lbs, but she was always more petite. She was very strong, though, and other than having cancer, she had been pretty healthy. You just might have a more petite girl, like I did. Now I have a big boy who owns my heart!