Neonatal Jaundice. To be worried about?

My daughter is 8 days old and today morning bilirubin test done for neonatal jaundice, amount is 15.5. Two days back it was 16.1. Our paed suggested to feed frequently as bilirubin leaves the body through baby's urine and stool output. Also, keeping the baby in morning sunlight for 15 minutes is required. They said phototherapy wasn't required at the moment and to keep an eye on the urine output (min 10 per day) but the baby is sleepy almost whole day. Is this normal? Also, are the bilirubin levels dropping normally or is there something to be worried about? Please note other details below - Baby's age - 8 days old Baby's Feed - On mother's feed. Baby's BW - 2.7 KG Born at - 37 weeks Baby's Blood Group - A+ Mother's Blood Group - O+ Baby's Urine output - 10 per day Baby's Poop Output - after every feed , seedy yellow poop. Thank you.