i had 3 month old baby and i am working mother. can i store my breast milk in fridge and giver her. or else can i start with formula milk daily for one time

A. Definitely you can store the bteast milk and give the baby. You can keep the pumped milk in warm temperature for 3 to 4 hrs and cooler temperature for 4 to 6 hrs. Store tge pumped milk in sterilized bottles. Do not heat the milk directly before feeding the baby. keep it in a cup containing hot water.