A member asked:

My 3.5yr old son has had a cold for about a week or so. and now when he blows his nose, yellow snot comes out. what is going on?

3 doctors weighed in across 2 answers

Yellow mucus: Take him to the pediatrician make sure he does not have an ear infection.

Answered 12/24/2013

4.7k views

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Dr. Oscar Novick answered

Specializes in Pediatrics

Cold: As noted your child has a cold. As the cold progresses the clear mucus begins to turn yellow because of the white blood cells that attack the mucus.

Answered 12/24/2013

4.7k views

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