Baby should be kept always on breast as soon as baby born either in normally or surgically. Generally the medications mother uses may be found small portion in breasts milk which is not harmful for baby.
After the baby is born, milk may not come out of breasts immediately. It may take from few hours to few days depending on baby's demand. Baby come in the world with built in food in stomach by nature for immediate survival for a certain time. When feel hungry after few hours or a day, baby try to find food in breasts and start sucking nipple and aerola. The bite and suck of baby stimulates inside the breasts and send signal by breast to brain to release milk., hence, breast start releasing of milk as per baby's demand and attempt to get it.