He's 3.6 and 2 stone 6lbs. He's been this weight for a year now (I know because I've been trying to shift baby weight for a year and he loves to jump on the scales when I weigh myself each week). He hasn't grown massively, he's about 103cms, probably gained about 2 or 3 cms in a year.
He eats ok, not a massively wide ranging diet, but healthy enough with plenty of cheese and yoghurts etc. I've put him back on full fat milk (he has a cup before bed) but he's quite skinny. He's healthy looking in all other respects though he is quite skinny, when I buy age 3 trousers they're always massive on the waist. Is it odd that he hasn't put on a pound in a year?