Ahhh alam ko yan, napaka-frustrating talaga! A few of us went through the same thing with our toddlers around that age, sometimes they just get tired of the taste or they're more interested sa solid foods na, kaya seryoso lang sila sa milk. Try mo muna i-warm up ang formula or lagyan ng slight taste ng banana or milo para mas interesting, pero honestly best talaga if you ask your pedia about this kasi baka may underlying reason or baka need lang ng adjustments sa nutrition elsewhere, they can guide you better on what to do next based sa growth niya.