You can wash it with or without the layers in place. Baby sleeping bags are used by over 95% of UK parents on their babies. Your baby is kept at the right temperature all night long. Your baby will wake up warm and is therefore more likely to go back to sleep. They are safer than sheets and blankets as your baby cannot slip down inside a baby sleeping bag. Your baby’s feet won’t get stuck in the cot bars. It will help make the move from a Moses basket to a big cot much easier. When travelling or in new surroundings, your baby will always feel comfortable in their own sleeping bag. Your baby has freedom of movement. It is harder for your baby to climb out of their cot!