Ds2 was born two full weeks early, and ds1 and ds3 were each 10 days early - ds1 did end up in hospital longer, but that was because he developed neonatal jaundice - which was nothing to do with his gestational age, as far as I am aware.
Ds2 and ds3 were born at home, and were both fighting fit.
They are now 20, 22 and 24, all taller than me, all fit and healthy and bright - none of them had any negative effects from being born early.
I am sure your lovely baby will be just fine, @sunshineonmyshoulder - please don’t worry - I know this is a bit of a daft thing to say - parenthood is about worrying, and there is always something new to worry about (feeding, weaning, school, boyfriends/girlfriends, driving tests, university, jobs) - but it is ALSO about learning to manage the worries, and keep them in proportion so you can enjoy all the phases of your baby’s life, from tiny, squidgy newborn, all the way to strapping 6- foot man, who can reach things off high shelves for you - and pats you kindly on the head when you ask - but is still your lad who needs a cuddle from his mum.