For me I would suggest to stop at the age of 1 years old. Good thing my husband dont dare to bath for his little one because his afraid he will drop his child or accident happend. So since our little one were NB, it was just me, my dad and my mum. Then after I am better, it was all me. I dont allow him to showering neither washing baby's poop etc. Unless there's no one in the house and I am unwell or totally tired. Otherwise ill do it on my own. I have thought my little one to understand that no opp gender should bath you at all. Only mummy can do it.