same for me when my baby was 4 months. it lasted a while and appetite came back. now when he started solids, sometimes he also has low appetite. likely because he likes solids
Sometimes the baby doesn't like the bottle or did you change the milk/bottle? Mybe you should change it back to the one he/she use to.. Good luck 💕
Try to change the bottle. If still the same then might be the milk
Yuyu