Hello Mum,
The medical condition is of baby or the mother...
In either case if the baby is born through Normal delivery or C-section mother's milk needs to be expressed out if not fed to the baby directly.
Breastfeeding is best.Formula has its own pros and cons.Should be discussed with Pediatrician before starting.
Next Steps
You can consult a Pediatrician/ Lactation Counselor ( I am one) for further guidance in Breastfeeding