http://kellymom.com/bf/normal/weight-toomuch/ The thing is that a fat breastfed baby isn't at the same risk factors as a formula fed baby. A fat breastfed baby isn't really a concern. And they tend to gain fast and taper out. Weight gain patterns between breastfed and formula fed babies are different. There is no evidence to suggest that a fat breastfed baby is at any risk, and feeding a fat breastfed baby on demand is shown to be protective. Now, a fat formula fed baby is a health concern. Especially if the formula fed baby gains a lot in the first 4 months. Breastfed babies regulate their own intake. Bottle fed babies are often encouraged to finish off the bottle. You can't make a baby nurse if they don't want to. If there was evidence showing harm for a breastfed baby to be fat, I would hate on the parents who made their baby fat. If the parents use formula and have a fat baby, they deserve the hate. I'm all for hating early childhood obesity. Once a baby is past the year mark, if it is chubby, it should lean out.