Why does a one-year-old baby sweat excessively during sleep at night?

Excessive sweating during sleep at night in a one-year-old baby may be caused by factors such as ambient temperature, weak constitution, or underlying medical conditions.

1. Temperature: A baby's thermoregulatory center is not yet fully developed and typically has more subcutaneous fat. If the indoor temperature is high, or if the baby wears too many clothes or is covered with thick bedding, sweating may easily occur. This can usually be alleviated by appropriately lowering room temperature, reducing clothing layers, or switching to lighter bedding.

2. Weak constitution: Babies with weaker constitutions may sweat excessively at night. In such cases, it's important to improve nutrition by consuming more protein-rich foods and engaging in regular outdoor physical activities to boost immunity.

3. Medical conditions: Excessive night sweating may be a symptom of rickets caused by vitamin D or calcium deficiency. Other associated symptoms include nighttime insomnia, frequent night awakenings, irritability,枕 balding (loss of hair at the back of the head), and excessive sweating during sleep. Typically, these symptoms gradually resolve with increased sun exposure and active supplementation of vitamin D and calcium.

In addition, excessive night sweating may also result from a naturally high metabolic rate, which is considered normal and does not require specific treatment.