Ah, tu memang common lah kalau tukar susu, digestive system baby ambil masa adjust, biasanya okay dalam 3-4 hari. A few of my mum friends pun alami sama, especially kalau switch dari lactose-heavy formula, so don't worry too much! Kalau after 3 hari still tak berak atau baby terasa uncomfortable/perut kembung, better check with your pediatrician sebab sometimes formula change memang kena observe ketat-ketat. In the meantime, boleh try gentle tummy massage, increase water intake kalau sudah makan solids, mummy will know best lah