Background: Utilization of Mother and Child Health service is a concept of expressing the extent ofinteraction between the service and the beneficiaries for whom it is intended. It will depict the health infrastructure and services given to them. Material and Methods: A cross sectional study was conducted in the urban slums of Purnea, Bihar. among 300 post natal mothers. Data was collected from mothers using a pre-tested, semi-structuredquestionnaire. Study period 15 Jan 2022 To 15 Feb 023 Conclusion: There is poor utilization of maternal services and decreased awareness about early registration, postnatal visit, decreased acceptance of IFA tablets and postpartum contraception. While all the mothers said they had increased the food intake during postnatal period particularly after the puerperium period. And the type of food consumed more during pregnancy and lactation was fruits, fish, milk etc.