Is it true...?

Kari
Is it true that breastmilk has the most nutritional value the first six months of baby's life? My son's pediatrician recommended I breastfeed at least six months, but if I wished to continue to do so. My baby is seven months old and I dont plan on stopping anytime soon, but my lovely (sarcastic voice) mother in law told me my milk no longer had nutrional value for my baby.