Akak, bunyi kroh-kroh tu mmg leceh kan! Tapi susah nak cakap susu tak sesuai just from that je, banyak benda boleh cause it, macam reflux, teething, atau memang minor congestion je. Yang terbaik is tanya pediatrician dia, especially since baby minum susu badan + formula, they can check if ada allergy sign lain (like rashes, tummy issues, or perut kembung) or just respiratory things. A few of us mums, babies kami bunyi kroh-kroh jugak tp nok ada apa-apa serious pun, so don't panic dulu! Tapi do get it checked out for peace of mind, sebab doc boleh tengok and advise properly, okay?