Giving formula milk with bottle and feeding again from breast , baby will be confused. ( nipple confusion). Taking milk from breast is like a exercise for the baby and from bottle it is not. Baby eventually may not like drinking from breast. Formula milk is always much inferior to breast milk. Emptying breast  completely by feeding, night time feeding atleast 4 times per night, enough rest and hydration for mother improves Breast milk production Formula milk if at all given, try to feed from a cup of freshly prepared milk. ( Proper quantity I.e, one scoop of powder with 30 ml of fresh water) . if too much water is added may cause green stool. Use galact granules 1/2 spoon twice a day for improved milk production for 1 week