Watch out for tongue tie: if the connective tissue that's right underneath the tongue goes too far forward, it can make it so the baby can't breath normally through their nose when on their back. If your baby sleeps with their mouth open, that's a sign. Our baby had this and couldn't sleep on her back until we got it fixed. I am not a doctor—talk to someone competent first!
Tongue tie is so heavily over-diagnosed and even treated right now. Just an aside to those in the thread, get a diagnosis from a pediatric dentist or other doctor, not a lactation consultant and not from the doctor that is responsible for doing the revision.
This might depend on where you are. If you're from the UK, the only way of getting this diagnosed within any reasonable time frame is a lactation consultant. Most NHS staff is not trained to diagnose tongue tie, which is not surprising given their historical roots.
Tongue tie was quite obvious for my first daughter (it even runs in my family), but hospital staff still refused to do a proper diagnosis and said it was fine. It was not, and impacted the breastfeeding.
It is a complex issue. Tongue tie is a real thing that causes real problems and lack of a diagnosis can lead to a lot of unneeded suffering and distress. Compounding this pediatricians are often not very responsive to breastfeeding concerns.
However, the placebo effect here is really strong. Firstly because tongue tie revisions are to fix issues that very often are the kind of thing that resolves on it's own. Secondly because parents are told they will see some sort of fix and they are putting their child through a procedure than can be painful so they will really want to see an improvement.
"A desire to increase rates of breast feeding initiation and absence of standardized criteria for the diagnosis of ankyloglossia have resulted in runaway rates of frenotomy for newborn infants in some parts of Canada."
You'll see a really unfortunate statement like this in almost every article discussing the issue "Randomized controlled trials of optimized lactation support vs. frenotomy and of scissors vs laser in performance of frenotomy are needed."
