The redness inside the baby’s nasal cavity is because the baby’s nasal cavity is congested or bleeding, which may be related to trauma, acute rhinitis, allergic rhinitis and so on. 1. trauma: may be more dust in the air, or foreign objects, such as animal hair, plant spores, etc., into the nasal cavity leading to the baby rubbing or picking the nasal cavity, resulting in a small amount of bleeding at the rupture of the microvessels of the nasal mucosa. 2. Acute rhinitis: mostly caused by viral infection of the nasal mucosa acute inflammation, resulting in nasal congestion, the baby nasal redness. 3. Allergic rhinitis: may be more dust, pollen or irritating gas in the air, leading to allergic reactions in the nasal cavity, nasal mucosa congestion manifesting the phenomenon of nasal redness. The redness of the baby’s nasal cavity can also be seen in other causes, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions to carry out relevant examinations, with the help of the doctor to clarify the causes, and targeted treatment or treatment.