Dangerous baby bedding

My sister lately had a very terrible experience, which caused her to even seek for professional help. She had her baby a few months ago and she and her husband did everything for the baby, they loved it and they waited for it so long and all they wanted was the baby to be healthy. They took care of it, and they were afraid that the baby would get sick, because it was winter and the baby wasn"t the strongest. My sister bought a very big and comfortable baby bedding, which was really too large for the bed, but she wanted to make it really cozy for the baby, so that it could wrap up in the baby bedding and always be warm. Unfortunately that wasn"t the wisest thing to do and thank God that my sister made it in time. The baby wrapped itself in the baby bedding so hard, that it couldn"t breathe. My sister couldn"t sleep and she went to check on the baby and she saved it. She had to rush to the hospital but the doctors managed to save the little girl and she came out of this unharmed. Yet my sister felt so awful, she thought it was all her fault and that she almost killed her baby because of the too big baby bedding, that she had to find psychological help, because she really couldn"t function normally after that terrible accident.