My daughter is 6 and has recently become slightly chubby. I'm not hugely worried and she still looks a healthy size but has a bit of a tummy and a puffy chest, struggling to fasten her jeans and things. This is unusual for her as she's always been slender. She is 50th centile for height and 75th for weight so a little out of proportion. She has a massively sweet tooth and LOVES any kind of sweets, cakes etc. I don't keep these things in the house but given any chance she will scoff 'treats'. She also perpetually asks for 'snacks' (doesn't get them) and eats large portions. She eats a lot at school - I've heard tales of seconds and seconds of pudding - even thirds!
She's active - plays football twice a week, swims twice a week and does a martial art.
My question is really that I don't know if I should be trying to help her slim down slightly so that it doesn't spiral? Should I be serving her smaller portions and saying no to seconds? I tend to think kids control their hunger naturally and I serve mostly healthy food, but I don't want to be blind to it the way some parents are. Should I forbid all sugary things for a while (grandparents etc)?
For context, I am slightly overweight myself by about a stone (size 12 - 14) and my husband is obese, so her role models aren't great.