Aiyah, bayi 2 bulan memang sering macam ni, ada "day/night confusion" period jugak, malam lapar, siang selective! Jarak 4 jam siang vs 2-3 jam malam tu sebenarnya masih dalam normal range untuk bayi yang dah boleh tolerate longer stretches, tapi kalau dia mau direct breastfeed, tu tandanya susu badan dia still preference dia (even kecil pun, dia suka), so maybe x perlu tukar formula dulu lah. A few of my mum friends found their babies also acted "picky" with bottle feeding around this age but settled down after a few weeks, bukan sign yang formula dia xcocok, just baby being baby! Tapi kalau baby consistently refusing bottle (even after 20-30 min chill) atau weight gain becoming a concern, better check with your pediatrician just to be safe, okay? Jangan stress dulu, mummy's doing great, steady ja!