Yes perfectly okay,however you should feed absolutely as much breastmilk as possible, using a pump if you have to, because there are many beneficial things
in breastmilk that are not
in formula. Breastmilk contains antibodies and other immune factors that pass on to the infant, and help keep him free of illness. However if your natural supply is insufficient, that's all there is to it, better to suplement..Congratulations on the birth let us know how she is doping ..