i have avoided this prog for precisely the reason that people with genuinely big children will be looked at as though they don't look after their kids. My dd is 22 months old and 29lbs, 83 cm- exactly on the 75th centile she was born on. Not amazing , til i tell you i am only 4ft 8, and was 8and a half stone at 9 months pregnant. She looks far too big to be mine, but she is by no means unhealthy!
(dh and i blame radiation/surgery for a broken wrist at 20 weeks)