Looking for advice, my 9 1/2 year old DD is putting on a bit of weight on her tummy area. She is exceptionally tall for her age, wearing 11-12 clothes, will be 12-13 uniform after summer even though not 10 till December. I have noticed recently, that although she is quite active, she is gaining a wider waistline. Is this puberty setting in? I have a DS who has always been a slim build. Concerned, about whether I should try to cut down food portions, or let it go as she is perhaps hitting puberty and it's puppy fat?