Our little one is so wiggly and wild during diaper changes! But these completely irresistible cupcake P.J.'s are so easy to zip her in and out of. she stays warm at night despite having to have her arms thrown up over her head to sleep and yet she's not too bundled up and comfy. She wears cloth diapers and her bum still fits pretty easily in her correct size. If your baby is a bit big or wears really fluffy ones, order up a size.