My 2-day-old baby is not urinating. Why?

Hi doctor,

My daughter is 2 days old. She is not urinating and vomiting the milk she drinks. The doctors say that the baby had some amniotic fluid intake during labor. During labor, my wife tried for six hours for a normal delivery. But the head was stuck. So, she opted for a cesarean. Now, the mom is doing good and the milk is not secreted yet. As there was no intake for baby due to vomiting, she is on drips currently to avoid dehydration. How long will it take for the fluid to come out of the baby? How long will it take generally for the baby to urinate? How long does it take for the mother to secrete milk? Looking forward to your opinion.