Aww sabar ye, transition ni memang tricky! Personally, a few of us tried Aptamil dan S-26 Gold, and honestly timing je yang penting, some babies accept it better kalau ibu introduce step by step, maybe start with mixing sikit-sikit dalam milk bottle sambil still BF. Since your baby dah 1 tahun 3 bulan, boleh juga consider growing-up milk instead of infant formula, tapi yang paling important is baby accept the taste and your supply management jugak so you don't get engorgement masalah. Have you thought about expressing at work, atau just lessen the feeds gradually? Every baby beza, so yang anak bestie sy terima mungkin berbeza dengan yours.