The study was conducted during the period of July, 1972 to June, 1973 in Seoul city and Choong Chung Buk Do area. The purpose of this study was to find out the Weaning Patterns and investigate the habits of health care of the babies. The conclusions obtained were as follows: 1. 65 percent of the infants were sufficiently fed by mothers' milk. But, the ether 35 percent were not ennugh to be breastfed. 2. Over 50 percent of the mothers started the weaning when the infants became 9-12 months of age. The period of time needed for weaning was between 6-18 months of age. 3. Majorty of the mothers preferred to give infants corns as the major diets. 4. It; was noted that many mothers did not know the importance of weaning. And it was felt that public health nurses have to instruct these mothers who are bringing up the babies why weaning is necessary. 5. Only half of the babies who were investigated were found to be regularly vaccinated with all the necessary preventive inoculation at Public Health Centers both in farming and city areas.