Nasal congestion in infants, mainly because the nasal mucosa capillaries are relatively rich, while the development of their own immune system is imperfect, easy to be stimulated by cold or hot air, or viruses, bacteria and other sources of infection, resulting in increased nasal secretions. Therefore, four-month-old babies with nasal congestion, you can soak in the bath, hot towels hot compresses on the bridge of the nose, to promote the expansion of nasal capillaries, to relieve the symptoms of nasal congestion. If the effect is not good, you can cooperate with the special saline nasal spray for infants to clean, so as to relieve the baby’s blockage. But also pay attention to, in addition to the symptoms of nasal congestion, whether it is also accompanied by fever, cough and other respiratory symptoms, if there is a need to consult a doctor in a timely manner, to carry out the relevant examination, to avoid the aggravation of the symptoms of respiratory tract infection.