Hello. We've been yellow for about 8 days, of which about 5 were yello…

Hello. We've been yellow for about 8 days, of which about 5 were yellow. The pediatrician said to lie under the lamp. But we have gas, and the baby has been sleeping poorly for two days. I don't know how she will lie under the lamp. How many days is jaundice normal in newborns? And when should I be alarmed?