Random I know.
DS born in water and mad on swimming. Also liked being in big bath with mum and dad from day 1. Even when v v small and a screaming reflux nightmare challenging baby you could put him in water and he cheered right up ASAP.
Friend's DS also born in water and mad on swimming, water in general.
Her MIL this this is because they were 'born water babies'.
I said I would ask MN to see if other people had noticed whether water birth babies liked swimming etc so here I am, asking.