Baby at Nine Months Old, Clear Mucus Turns Yellow, What’s Happening?

My baby, who is nine months old, used to have clear mucus but now it has turned yellow and is a bit thick. What could be the cause? Is it serious? The baby’s mouth is full of sticky saliva, almost like they’re swallowing mucus. The baby often swallows saliva. The nose is severely blocked, but everything else is fine. What medicine should I give to treat the mucus? It’s very uncomfortable. Should I give an antibiotic? I’ve already given him cefpodoxime.
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