Unlike feedback from an evaluation by your peers say at a centre or in a school remember that your parents won't be privy to very much that goes on so your questions and what they are able to respond to may be very limited. At the same time this could be a good time to ask questions moving forward since you interviewed them when they had a baby now the child is older and doing different things and a good way to be sure you and the parents are on the same page - ask them about the child on the weekends - naptimes, favourite foods, food dislikes, etc.