The nasal congestion of the baby appears in the second half of the night, but there is no obvious abnormality in the rest of the night, which is considered to be related to the temperature of the environment. Usually, the second half of the night is the time when the overall ambient temperature is the lowest. Too cold air and too low temperature will cause cold stimulation of the baby’s nasal mucosa, thus swelling and congestion, which will make the nasal cavity relatively unobstructed, and nasal congestion will appear. At this time, you can try to cover your baby with more blankets and pay attention to keep warm, especially in the latter half of the night, it may be necessary to temporarily add a blanket. When nasal congestion is obvious, you can give your baby a localized hot compress for the nose, such as using a warm towel and covering the top of the nose; you can also press and rub the Yingxiang point to relieve nasal congestion. If the nasal congestion persists without improvement or if other complications appear, it is necessary to consult an ENT doctor for further examination and judgment.