"Fraternal, although they look identical. Breastfed exclusively for six months -- still going no bottles no formula (except now in cereal) learning to drink from cup... I think that hospitals tend to push women into formula because it makes it easier for the nurses to feed to tend to the babies BUT the first three weeks of breast feeding are always the hardest for the mom. WE JUST NEED TO STICK IT OUT. It is the best thing for your baby. No man made product is going to be better for your child. If you took care of yourself & your baby for your pregnancy why stop now?"