Because a baby is a small mammal seeking the warmth and heartbeat of its caretaker. This is of utmost importance for its wellbeing and proper development. Taking that away to avoid a tiny chance of death? It's up to you. I chose the small risk. I chose many small risks throughout my kid's life because I believed taking them all away and coddling them from every danger would make for a very reduced learning experience and a lot less love and fun.