Pls help!!! Baby refuses to drink milk

Hello mummies! When my baby was about to turn 4 months, she was going through the 4 months regression. Baby refused to drink milk and sleep well. Now she is turning 6 months but she still refuses to drink milk properly. She only drinks well when she Cries in hunger which is like 6 hours apart. Sometimes she doesn’t even drink even when it’s been 6 hours since hee last feed. I started her on puree 2 days back since she doesn’t drink milk much. But milk is still important. Any mummies going through the same? It’s really frustrating. She is on combined feeding. She rejects both fm & BM also!