Eh, don't suddenly switch like that lah, biasanya kena gradual transition, mixing the old and new formula slowly over a few days so baby's tummy boleh adjust, otherwise memang akan upset stomach, muntah-muntah la. A few of my mum friends yang langsung tukar jugak kena balik to the old one because baby's digestive system tak ready for the new formula, so definitely ada gap kena ada. Try mixing maybe 25% Dutch Baby with 75% Habib for a few days, then increase the ratio slowly, this way baby's system can handle the change better, and you'll see whether it's the formula itself or just the sudden switch that caused the reaction. If after proper transition dia still muntah or restless, check with your doctor about which formula works better for baby's system, boleh jadi baby dia memang more sensitive to certain ingredients.