I do sometimes see women shed weight faster after they stop breastfeeding (I work with pregnant women and new moms)..it’s almost like your body is holding on to the extra pounds while BF.   She’s wrong about all new moms being fat though, it absolutely is not the case. All pregnant women gain some weight in pregnancy but if you were fit with good eating habits before you got pregnant, chances are, you are going to spring right back to normal weight soon after you give birth.