My kids sizes seem to be a bit different from their classmates. My oldest is 9 she is 4ft5in and 72 lbs she seems to be the right size to me but is smaller then her friends. My second born my only son is 7 he is 4ft7in 82lbs he isnt fat but very solid he is the biggest in his class (height wise) and his friends are all so short next to him. My one 4yr (twin A) is 3ft8in and weighs 40lbs she is smaller then most kids in her class but there are a couple bigger then her. My other 4yo (twin B) is 3ft6in and weighs 31lbs she is the smallest in her class. All of my kids eat the same food. All food is portioned for their age. I dont allow more then one snack a day and if they want seconds at meals they can only have extra veggies. How on earth are their sizes so different? They all have the same dad so its not from different genes. If i compare their growth charts at the same ages those are all very different. They were all about the same birth length and weight with the smallest being 5lbs12oz 19in long and the biggest being 6lbs9oz 20in long. Are they normal size for their ages? Are your kids about the same size as the rest of your kids at the same age?