Both of mine were breech (confirmed by u/s) until 30-34 weeks, and then turned head down. I think that's relatively normal? (Not sure.) DS stayed there; we'll see about this one, but he doesn't have much room left to move, so it would be strange for him to flip back at this point.
I don't know if this was a factor, but I drink a ton of ice water in general, and it's my absolute favourite thing when pregnant. Both pregnancies, the baby moves like crazy when my stomach is full of icy liquid. Again, I have no idea if this is true, but I suspect it may have encouraged them slightly to decide that they'd rather freeze their bums than their heads. I also spend time on hands and knees stretching (great for my back, I find) and this pregnancy I am swimming a lot, which I do for exercise and because I love it, but I also understand it encourages the babe to be in a good position. Last week, the babe was wedged in in a way that did not feel right (very uncomfortably up in my ribs/lungs), but I went for a swim that night and after an hour of front crawl, he was back in a more comfortable position.