Backing up Kim - NHS midwives don’t get adequate training on it in general. Multiple midwives and health visitors told me both my children didn’t but they did - they were posterior ties which are less obvious. First baby I went to a breastfeeding clinic who gave me the names of a few private practitioners. With my new baby I was lucky to have a midwife who had trained with a specialist so she identified it and wrote my referral so I was able to get done on NHS. definitely worth going private if you think your baby has it. Things to look for including baby falling asleep at the breast, short feeds, milk leakage, a clicking sound when feeding and the worst for me - agonising, cracked, bloody nipples!
Your midwife/HV should be able to refer you to an infant feeding team. They will check it and they will also watch how he feeds and offer advice to improve position/latch etc..
We had very similar and went to the local feeding support group called cherrubs in Cheshire. They checked him and said he did and we then went for a private treatment
Midwifes have checked my boy twice and said its all good. 7weeks in breast feeding and im still sore. Went to breast feeding groups and the bf specialist has reffered us to a tongue tie specialist as she believes he has a subtle one. Midwifes are not specialists and they can miss it if its not an obvious one. They were looking at the latch, how high he can raise his tongue, if he can move his tongue to the sides properly and if breast feeding hurts.
Ask to be referred to infant feeding team or go private to a practitioner. My midwives told me they don't have specific adequate training x