Your breastmilk continues to be a highly-nutritious, easily-digested food even as toddlers or young children add other foods to their diets. There is no age at which breastmilk loses its nutritional or disease-fighting value. The antibodies in breastmilk actually increase after the baby is 12 months old. This provides added protection for toddlers who have more opportunities to pick up germs. In addition, glands in the breast can produce antibodies against illnesses the toddler is exposed to.