How to solve the problem of phlegm in a baby's throat?

Patient's question:

The newborn baby is 15 days old today. I've been feeling like there's phlegm in his throat lately, with a constant "hooo hooo hooo" sound. Should I take him to see a doctor?
A few days ago, when the baby was discharged after receiving blue light treatment, there was a high value for CPR? CRP? Should I get a recheck?
Why does the baby refuse to directly breastfeed? He only eats for a few minutes and then stops. Is it because my milk isn't enough?
The bottle feeding requires 70ml?

Doctor's answer:

According to the situation you described, the newborn currently has a rattling sound in their throat and only nurses for a few minutes. With phlegm in the throat, it is recommended to first hold the child upright and gently tap their chest to help clear the phlegm, and see if it improves. At the same time, nurse the child once while holding them upright. The feeding time should be around 15~20 minutes. If the child stops eating after just a few minutes, it means they are full, and it is recommended to feed them on demand. Also, pay attention to giving the baby more warm water.

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