From the history, baby's age is 1year. A 1 yr old baby need complementary feeds in addition to Breast milk. Solid food should have been started which initially as mashed and pureed, later adding little texture...As long as baby takes solid feeds, Breast milk can be conplementary and not the main source of nutrition. Check urine output, if good wet nappies 4-5times a day then feed must be sufficient Need more history to answer further