If a 2-month-old baby’s throat is purring after birth, but the baby’s growth and development is normal, especially after the child eats milk or cries, this sound may be congenital laryngeal cartilage dysplasia, also called congenital laryngeal wheezing, and the mother’s fetal vitamin D deficiency is related. In general, vitamin D and calcium supplements after birth can heal on their own within one year of age. If the baby has recently developed a throat whirring, accompanied by a runny nose, nasal congestion, or fever and other symptoms, it is necessary to consider the respiratory system infection. You can take pediatric cold medicine orally for 3-5 days and spray the nasal passages with physiological sea saline spray. If the baby presents with a temperature over 37 degrees 2 and a significant cough, it is recommended to visit the pediatric internal medicine department for an interview to rule out bronchitis or pneumonia.