Baby Sleeping bags such as Grobag or Izziwotnot are a popular alernative to sheets and blankets because the great thing about them is that your baby can't kick them off, which means they are less likely to wake up because they are feeling too cold or too hot.  Normally you will only need a bottom sheet when using a sleeping bag - but if it is very cold you may want to add a cellular blanket or top sheet.  Come along to our retail store for expert advice and demonstration or purchase online the choice is yours!!!