Ah sis, I think it depends on the water temperature and how you're mixing it! A few of us tried the new formula and yung iba nagsabi bumubula talaga sila kahit maingat sila mag-mix, habang sa iba hindi gaanong bumubulaeven with the same formula, baka rin it's how mabilis mo sini-shake or stirred? I'd suggest asking your pediatrician or calling the hotline ng Bonna directly kasi sila ang best makakaalam if that's normal sa new formula or may adjustment lang na kailangan sa preparation.