Ay normal lang yan, mommy, lalo na first time nyo mag introduce ng formula, sometimes ang babies ay ayaw ng lasa or texture pa lang kaya they spit up din, at ang crying while drinking is usually frustration or adjustment lang talaga! A few of us tried mixed feeding din at experienced this sa first week or two, pero after a few days tumaas na acceptance nila ng formula once they got used sa taste, kaya wag mag alala. Since sinu-suka siya pa though, mas better if you check with your pedia para ma rule out kung may other concerns na, but honestly most likely adjustment period lang yan, just introduce slowly and let him warm up sa bagong routine, you got this mama!