Croup is a common respiratory infection in children that causes the upper airway to swell. That makes it difficult for little ones to breathe. You’re more likely to see (or should we say, hear) croup during the fall and winter months. It’s most severe in children under the age of 3 and is rarely seen in kids over the age of 5. The biggest red flag for croup is the signature seal-like barking cough, which is typically worse at night. It can be very high-pitched and can be unsettling — even downri