What to Do When Your Baby Refuses to Drink Formula Milk and Keeps Crying

My baby is four and a half months old and has been refusing to drink formula milk for the past month. She cries whenever she is fed, often starts dry heaving after just a few sips, and has even thrown up a few times, with the vomit sometimes looking like curd. She only seems willing to drink when she’s almost asleep. I’m worried if there’s a disease, and I’ve given her probiotics but the situation doesn’t seem to improve. What should I do?
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