DS is 15months and goes to nursery 4 afternoons a week. He started at 10 months and was initially very distraught when we left him. He now goes in very happily. Until recently when I collected him he would rush over to greet me and wanted cuddles. In the last month when I have gone to pick him up he is uninterested and just wants to carry on playing. In some respects I'm happy that he is comfortable there and wants to play but I'm also a bit worried that he doesn't want to be with me when I turn up. What would you suggest?