If your child has a harsh and barking cough (which sounds a bit like a seal), hoarseness, runny nose, and a mild fever, he or she may have a condition called croup.
Croup is a problem that affects most children during early childhood. It is caused by a viral infection that causes swelling in the trachea (windpipe) and larynx (voice box). Croup is most common in children under the age of 5 years, and especially those under 3 years old.
More boys than girls are affected by croup. Croup can be scary for children and parents, but it's not usually serious.