What can I give to my 4 month old baby except milk?

Hi, Why do you have to give the baby anything except milk. If your baby is breastfeed, then there is nothing else your baby requires before 6 months. Mother's milk has all the nutrition that baby requires, and even if you are giving him formula milk, then also there is no need to feed him anything else. Formula milk too is made to meet all the nutritional needs of the baby.