What’s Wrong with Gastroesophageal Reflux?

My baby is three and a half months old. Since one and a half months ago, she has started to spit up milk after almost every feeding, sometimes a lot, sometimes a little, and it often comes back up. We’ve been to the hospital, and the doctor said it was gastroesophageal reflux without doing any tests. Please ask the experts, does my baby have gastroesophageal reflux? Do I need to give her medicine?
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