We are moving house in a couple of weeks. DD will be 5 1/2 months old. Up to now she's been sleeping in a crib in our bedroom. She sleeps in a carry cot at my parents house. We have a cotbed for our new flat and she will have her own room. Should we just change everything in one go or do it step by step? Due to complexities of the move, taking the crib isn't an option.