The trick is not to put the baby on very tight clothes, let them wear clothes with stretchy fabric and the biggest tick of all is to, use powder, sprinkle it in there so baby will be covered all over everywhere properly, you don't want to miss places because that when the nappy rash start, and the thing about powder it works very well with diapers than Vaseline and bum cream and well my kids didn't feel comfortable with Vaseline and it really just destroys the diaper, they just open up on the side and all of the things start falling off without the diaper being full, with a newborn it different because they don't move around everywhere, but when the baby starts moving around the best bum protector is powder, you don't have to worry about nappy rash and the diaper stay for longer.
