Adeh, kahak tu normal la actually, baby still adjusting to swallowing & breathing sama-sama pa, especially kalau dia minum cepat sangat atau susu masuk hidung sikit. Try burp him more often during feeding, let him rest a bit between sides, and keep his head elevated slightly when nursing, a few of us tried positioning baby lebih tegak and it helped reduce the gagging. If it's happening every single feed or dia looks uncomfortable/wheezy, better check with your pediatrician just to be safe ya, but honestly most babies outgrow this dalam few weeks as their reflex gets better!