My babies all varied, too. My baby is 5 months and weighs 8 kgs, yet his big sister was only around 6 kgs at the same age. They were (baby still is) exclusively breastfed and did (will) not start solids until six months. It does make a difference, sometimes, between breast and bottlefed babies. My first was bottlefed and put on a lot more chub early on. My last baby, however is not fat, he is just very solid and heavy. People can't believe how heavy he is because he doesn't look that big. Even now, like Tepe's situation, my little girl is 5 and weighs 16 kilos and my 2.5 year old son weighs 15 kilos. Again, he is not fat, just very muscular and solid. He is also tall for his age, as is my 5 month old. In fact, he is in the 95th percentile for height and weight and the doctor weighed him twice because he just does not look it! You will also notice in your baby book, that boys are meant to be heavier and taller than girls at this age.
Domestic Goddess Mum of Four!