Hello moms, my child is 23 days old. He has jaundice, bilirubin 250. H…

Hello moms, my child is 23 days old. He has jaundice, bilirubin 250. How to treat it? The doctor prescribed Colasac for 10 days. We've been taking it but there's no visible result. It's been a month now, can we give him water and how much ml? We're breastfeeding.