Have spent all evening trying to do some research into the labial frenectomy procedure, ENT specialists in the local area, etc. Am getting absolutely bloody nowhere, apart from more and more frustrated.
To cut a long and boring story (about breastfeeding, mostly) short I am convinced that Isabel has a maxillary lip-tie: i.e. there is too much skin holding her top lip to her upper gum. It’s something I’ve been wondering about for some time (after wrongly? assuming she had a tongue tie at 12 weeks due to similar symptoms) and have basically confirmed by taking a picture of her lip while she was sleeping (that sounds creepy).
Sigh. So many problems (past and present) suddenly have an answer!