Level 1: Analysis of symptoms and causes of cold and nasal congestion in infants 1. Symptoms and symptoms Nasal congestion in infants and colds refers to symptoms such as nasal congestion, runny nose, sneezing and other symptoms caused by congestion and swelling of the nasal mucosa due to colds and other reasons, and increased secretions. Generally speaking, the symptoms of infant cold and nasal congestion mainly include the following aspects: 1. Nasal congestion: The baby has difficulty breathing and is prone to apnea while sleeping. 2. Runny nose: The baby has clear, watery nasal discharge, which is not easy to dry out. 3