Mine was almost full term (38 weeks) and huge and her big toe nails are always brittle as well, Im not really worried to be honest
Does he have an iron supplement?
It happens as they start rolling around and crawling. They snag on things and split
It’s been this way since birth they were tiny little triangle nails not formed on the sides at all. They are so brittle I just worry if the come ingrown
My eldest was born 5 weeks early but all his nails were present and formed, but they’ve always been fairly brittle and prone to breaking (I had no idea that could possibly be related to being preterm?!) he’s 3 now and they’re much the same. But I figured it’s just because he’s on the go and they take more wear than his fingernails, running, climbing, socks, shoes etc.