Hello, moms! Such a question, my little one wakes up every day at nigh…

Hello, moms! Such a question, my little one wakes up every day at night crying, 3-4 times, every day. I can't calm her down, only when I give her a sippy cup she falls asleep. What could be the reason? It has been going on for almost 1.5 months now. The doctor said she prescribed some sleep aids, but nothing changed, still the same.