The common causes of sudden snoring in 3-year-old babies include respiratory obstruction and nasal diseases. Parents should take their children to the hospital for a detailed examination before choosing the right treatment plan for the cause. Common causes: 1, respiratory obstruction: for example, the baby has enlarged tonsils, resulting in narrowing of the airway, and will snore when sleeping. Some babies, due to adenoid hypertrophy, resulting in narrow airways, sleep will also appear sudden snoring phenomenon; 2, nasal disease: for example, due to rhinitis, sinusitis resulting in nasal mucosa congestion, enlargement, resulting in nasal obstruction, nose ventilation is not smooth, the baby sleep open mouth breathing, will appear sudden snoring. Treatment: 1, 3-year-old baby with tonsil enlargement symptoms, according to the blood test results in the doctor to take azithromycin or gold and silver granules, can reduce inflammation to swelling. If the enlargement affects sleep, there are more than 5 recurrent infections within 1 year, or purulent tonsillitis, surgical removal is recommended; 2. If the baby’s adenoids are enlarged in degree I and there are no symptoms, they can be left untreated, and if they reach degree II enlargement, they can be treated with nasal spray hormone and oral montelukast under the guidance of the doctor. If the adenoids do not atrophy after medication, the baby still appears to open mouth breathing or snoring phenomenon, it is recommended to undergo minimally invasive surgery to remove; 3, rhinitis or sinusitis baby, parents can give the baby under the guidance of the doctor to consume Mometasone furoate nasal spray or Renolcort to relieve nasal congestion, and at the same time can be treated with oral rhinitis pellets, loratadine or cetirizine and other drugs. Caution: If you snore for a long time, it will lead to chronic lack of oxygen to the brain and affect your baby’s growth and development. Whether or not the baby has pauses in breathing, sleep monitoring is required and the appropriate examination needs to be done at the hospital.