Dear ,dont worry
Sometimes baby having lactose intolerance so avoid milk.,as baby is 1 year old stop breast feeding
Take opinion of your treating peadritician
U can give baby formula feed in water , clean the utensils properly in which u prepares ,clean feeding bottle ,better u should change frequently ,dont use plastic container better
For time being u can start multi vitamins with zinc containing drops only with advise of doctor
Next Steps
consult your treating doctor