Possible lip tie?

Caitlyn
I posted a few days ago about feeling like a failure because breastfeeding was not at all going well. My baby ended up with really bad jaundice, and finally after spending the last few days under a biliblanket his levels are under control, and he's starting to gain weight back. I'm pumping and bottle feeding him and he's eating a solid 2.5oz per feeding.
Well I spoke with his doctor about a lip tie, and he said it was unlikely and wouldn't check.
I have an appointment at the lactation clinic on Tuesday but I wanted to post here first as well. From what I've seen online this looks like a lip tie to me but I've never experienced this with my other children. I noticed it when I got him to latch after about 20 minutes of trying, that his top lip curls under no matter how much I pull it up on my breast.