Grumpybum slimmed down something severe after she turned 2 - you could see all her ribs and she clearly wasn't a plump little thing anymore. She was eating like a bird and getting taller all the time but not weighing a spot more.

Then suddenly discovered food, ate anything that wasn't nailed down, shot up a clothing and shoe size in less than a fortnight (literally went from her sandals fitting perfectly to her toes hanging out the ends) which necessitated a bit of an emergency clothes buying spree as I looked like a horrible mother having a kid clearly in clothes 1 size too small, and now she has a comfortable layer of fat on her again (which coincides with her naked thing from the other thread lol). They just go through stages.