When my bb was born, I use both breastmilk and milk powder, Enfamil A+ to him.
Eg: He finished my breast milk at 8:00 a.m. than the next time 10:00 a.m. I give 2 oz Enfamil A+ milk powder, and the 12:00 p.m. breastmilk again, etc..
This is the good way to feed your bb if you are not enought milk.
The better to gain milk, drink more milk, fish soup, pipare soup. You need more potein food or drink to gain milk ga.
Try your best to feed your bb la, breastmilk is the good food for bb, please dont give-up.