Baby refused to feed

Anyone else with a baby that doesnt like drinking milk? 😓 We started having feeding issues since she turned 2 months old. At that time what we’ve been hearing from ped and other parents was developmental leap caused it. Fast forward to almost 4 months next week we are still struggling with feeding.

These past few days things get more and more challenging. She started to sleep through the night (8/9pm through 5/6am) but she did not catch up with the missing bottles. Like this morning, she woke up at 5am, drank 110ml of milk. Took another “nap” woke up at 9am. We offer milk and she only drank 20ml 🤦🏻‍♀️ Subsequent feedings were also bad ... she drank 85ml at 11am and 60ml at 1.30pm. As if her stomach was upset bc she sleeps too long.

We tried changing her bottle nipple flow twice - she is now on MAM number 2 nipple (slow flow). For context she is drinking a combination of breast milk and formula. She does not spit up frequently but her big sis had pretty bad silent reflux so we are taking reflux as a possible cause here...

If you’ve experienced this with your baby ps share some ideas or just share your experience. Really hoping to see light at the end of the tunnel bc this stressed both me and my husband a lot. TIA!