Feeling lost

My baby has been going through this phase for about the last month or two where she doesn’t want to eat. She isn’t fussy and is still happy but she didn’t meet her growth curve at her 4 month checkup. She had a weight check at 5 months and was back to normal but it just worries me when she doesn’t eat. It puts me in such a funk because I don’t know what to do for her. Some days she barely eats 23 ounces, and it’s a fight to get her to that. She gets to between 2 and 3 ounces and then just stops eating and smiles. Then refuses the bottle.

Someone please tell me if this is normal and how I help my baby? We went to stage 2 nipple already and that helped but not a lot. I’m just at a loss.