Most children outgrow morning naps quickly once they start daycare. They notice that no one else is going down and they don't want to miss anything. If this child is miserable all morning without a nap, then make life easy on yourself and let them nap. As long as they are still sleeping in the afternoon, it just makes it easier on you and more pleasant for the child. If you start having trouble getting him to sleep in the afternoon, gradually make morning naps shorter and shorter.