Hi mama! For a newborn, honestly most of us start with around 8-10 bottles total, mix ng 4oz and 9oz depending on baby's age, pero as newborn pa lang go for more 4oz since they drink less. The 9oz bottles are better when baby's around 3-4 months na and drinking more, so you can get away with fewer bottles overall. Pro tip: start with what you can afford, then add more gradually once you see kung gaano kalaki ang appetite ng baby mo, every baby's different anyway, at may friends ako na nagstart with just 6 bottles and it was enough dahil frequently nila inlalabas agad.