Mother Cat Moving Kittens

Mother Cat Moving Kittens

Our cat had four kittens about one week ago. She gave birth to them and has been with them for the past week in a birthing box which we set up in a closet that we had cleared out for that purpose. The mother and babies are all doing well and our cat seemed very content until yesterday when she suddenly started moving the kittens to a location under one of the children's beds. When the kittens are returned to their original spot out cat will pace and meow and the first opportunity she gets she moves the kittens back under the bed. Does anyone have any ideas about why our cat is behaving this way and how we should handle it? Thank you! Tam