This does sound like a croup infection which is caused by a virus infection of the larnxx. The virus causes inflammation of the vocal chords. Croup usuallay lasts for a day or two. It certainly helps to let him spend some time in a steamed up room. If he becomes pale or if he has a blueish tinge to his skin or if his breathing becomes more noisy or if he appears to be uncomfortable and seems to be working hard to breathe he must immediately be taken to a doctor.
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