call the NICU and ask. Sometimes they put quilts over the isolettes to block the light. I had a friend whose baby came early, and I called and asked a nurse in the NICU about it. She gave me dimensions for what would go over the isolette and told me that to be allowed in the NICU it had to be washed and double rinsed. Each hospital is different, but it would be worth a call. The nurse thought it was a really sweet idea.