Because your LO is still very small, I feel it's best to show him to a doctor. It could be just mucus remaining in his airways, or something really uncomplicated, but best to get it cleared out. Is this phlegm affecting his feeding? Or does it come out if she spits up? One thing you could try is to reduce the use of the aircon as your son may have sensitive airways.
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My one month newborn also having this issue now. I’m worried. How do you resolve it ?