Sayang, 3 hari tak berak memang boleh jadi tanda constipation, please bring baby to clinic or klinik kesihatan today, jangan delay lagi sebab baby baru 19 hari. Doctor kena check dia properly, bukan kat rumah boleh decide sendiri. One of my mum friends' baby pun macam tu, turned out perlu slight adjustment dalam feeding, but kena consult with doc dulu, boleh jadi banyak factor, bukan just susu. Don't change the formula on your own yet, tunggu doctor advice aaa. Hang in there, mama!