How to deal with a 1.5-year-old baby who doesn't sleep at night?

Patient's question:

No

Doctor's answer:

This is a common sleep disorder in infancy. The reasons for this situation include: first, physiological crying, such as a wet diaper; second, environmental adaptation issues; third, insufficient daytime exercise and improper napping schedule; fourth, being affected by illness. First, wait and see, and then make some adjustments.