Eh, ni tricky sikit sebab it depends on baby's age and how much formula dia dah minum, but generally a few of us tried doing it gradually, replace one formula feed dengan direct breastfeed, tunggu 3-4 days, then ganti another feed, macam tu la step-by-step. The thing is, kena make sure supply kita cukup dulu, so kena keep pumping or direct feeding frequently, and monitor baby's wet diapers to ensure dia dapat enough milk, kalau worried, better check with your lactation consultant or doctor ye, they can guide based on baby's weight gain and your situation. Mana bulan baby you?