Aww, I understand how worried you must be! Constipation at this age memang stressful. Honestly, dari cerita mums around, Dupro and Dutch Baby memang boleh cause constipation pada some babies, a few had the same issue where their little ones tak berak for 3-4 hari, even though the babies were active and feeding well otherwise. Since your baby is still very young at 1 bulan 28 hari and already showing signs of difficulty, mungkin boleh consider trying Lactogen or mixing feeds (some mums shared that mixing susu actually helped their babies' digestion), tapi sebaiknya discuss this with your baby's paediatrician first, they can advise on the best formula switch and confirm everything is okay. Jangan khawatir too much, you're doing the right thing by looking into solutions!
Rohaina Ahmat Bakar