I'm sure this is probably well known on here but I have just googled to see if there is a linked between UAT and being born prematurely... Well, what do you know!
nature.com/articles/nrendo....
Lots of articles but this was of particular interest to me as I was born at 29weeks and 6days.
Preterm birth, especially that occuring very early (gestation <32 weeks), was associated with an increased risk of medically treated hypothyroidism in young adulthood, independent of fetal growth and other potential confounders.
Slowly but surely more pieces of the puzzle fall into place!