Phototherapy is Divided Into Two Main Categories- Conventional Phototherapy – The baby lies on a blanket with fibreoptic cables; light travels through the fibreoptic cables and shines on the baby's back. Fibreoptic Phototherapy – The baby lies on a blanket with fibreoptic cables; light travels through the fibreoptic cables and shines on the baby's back. The goal of phototherapy is to expose your baby's skin to as much light as possible in both techniques.