Aww mama, this sounds stressful! It could be the formula itself, or it might be something like reflux or a tummy issue that started recently, kaya parang lahat ng milk ang culprit kahit hindi talaga. A few of us tried switching formulas din and realized the baby just needed burping better or needed na elevated habang kumakain, so dapat talaga check with the pedia muna to rule out kung may medical reason. Since Bonna worked even for just a day, pwedeng yan talaga ang better fit for her, but let's make sure hindi iba ang problema, baka may lactose sensitivity or allergy na biglang lumitaw, or kahit simple constipation lang na nakakaaffect sa feeding. Sayang talaga ang milk, pero health ng baby ang priority, so I'd say schedule a doctor's visit ASAP para ma-confirm kung okay lang siya or kailangan ng adjustment.