7 week old

So my baby a week ago was eating 3 - 4 oz everyday every 3-4 hours ( formula fed on Nutramige) now it’s hard to get any food in him and it’s like we have to make him feed. All he will consume is 1-2 oz now. He has been having 21oz in 24 hours and that’s cause I’m trying to make him eat. ( if he really doesn’t want the bottle I stop and dont force it down his throat) we had an appt on the 16th and the doctors are worried about his weight he ended up losing weight. He was 10lb 3 oz at 4 weeks and at 6 weeks he was down to 9lb 12 oz. I had a Dentist appt yesterday for him and he does have a lip and tongue tie that the Dentist will be using laser to release. Did any moms that had this issue babies gain weight after the release. I’m so worried about my boy losing weight and hardly eating that he is going to fail to thrive. My anxiety is out the window and hope he is okay.