Ds1 (4.10) was weighed and measured at school and we received a letter today telling us he is on the 91st BMI centile and therefore is just into the overweight category.
Of course I am upset. I had no idea there was a problem. I suppose he does look a little more 'solid' than some children, indeed some children I see do look particularly tiny. Ds has no rolls of fat, no double chin and his tummy still sticks out a bit (only noticeable when naked) and you can see and feel his ribs.
The last time he was weighed and measured (about 2 years ago) he was on the 75th centile for height and the 50+ for weight - so longer than wide. However, now these seem to have swapped over and he isn't so tall but appears to be chunkier.
I have always considered his diet to be good. The booklet the NHS have sent is full of tips about cutting down on biscuits, crisps etc but we very rarely have these. We don't keep biscuits in the house, or crisps. He loves all fruit and mostly snacks on that or oat cakes but he doesn't snack a huge amount at all. We may put peanut butter on the oatcake, but spread it thinly. Puddings are fruit, alone or with Greek yoghurt. About once every six weeks or so we bake flapjacks or fruit muffins. We visit MacD's once every six weeks or so. Dh cooks all our meals from scratch - pasta sauces etc. I noticed today he'd put a little butter on the potatoes and carrots - should we not be doing that at all?
Among my friends, I am considered on the strict side regarding food but, in fact, nothing is off limits but it is limited, iyswim. His diet has a few 'naughty' things in it but is basically pretty good and very low on processed food. He only drinks water with the occassional glass of milk or carton drink when we are out - a couple of times a month.
He walks to school, goes to the playground for 30-40mins every day, has swimming lessons once a week, dance lesson once a week and uses his scooter, balance bike or legs 
both days of the weekend pretty much without fail. He is not a total whirlwind, like some boys his age, but that is just his nature and he's certainly no couch potato either.
I just feel so down about this - like we have let him down. The letter is saying about how he is likely to suffer from health problems and be overweight as an adult and I could just cry. Yet looking through the tips, we already do pretty much everything they suggest. I really didn't think young children were supposed to follow a 'low-fat' diet, I though it was about balance but we've obviously got it wrong 
.
Would love some suggestions from anyone about what we could do about this.
Btw, I am not overweight (slightly under) and dh is a little but he is ridiculously tall so hides it well! We all eat the same food, pretty much, though not the same portion sizes, obviously.