So my son was born on the 25 percentile wieghing 6lb 12oz he then moved up to the 50th percentile at 3months wieghing 13lb 7oz and then the 65th percentile at 4months wieghing 16lb 9oz. Today he was wieghed after 4weeks at 17lb 13oz and HV said he was on the 75th percentile however when i checked the book after shw marked him two weeks behind so he is actually on the 66th percentile. His length was 99th percentile when measured 4weeks ago. Should i be worried? My baby doesnt look over wieght at all he has chubby cheeks but not overweight.