Duty and obligation of every family, health care and society is to secure an access to nutritiously rich diet to every child since birth. This is a precondition for achieving optimal growth and development and attaining the best possible health standard. An infant doubles its mass from birth in the first six months and triples it within a year so a poor and inadequate diet presents a risk of immense consequences for health of a child at that age and for its future. Mother’s breast milk is the best source of much needed nutrients for the child in all stages of infancy, even longer according to recommendations from WHO. In cases when a successful breastfeeding is not possible to establish factory adapted milks for infants are especially recommended as nutritiously most quality replacements. Considering the fact that mother's milk cannot completely satisfy infant's needs for nutrients after a certain time, a process of introducing nutrition supplements should begin at earliest by the end of the fourth month and latest by the end of the sixth month of its life. Nutrition supplements are all introduced edibles that are not milk. Nurses have a big role in education of mothers and families about all of the possibilities, fazes and eventual complications with diet at infancy. A nurse should already start advising in the delivery room, at the hospital, through health visits, paediatric outpatient department, support groups for breastfeeding and similar organizations