A 3.5-month-old baby always wriggles during sleep.

Generally, a three-and-a-half-month-old baby frequently tossing and turning during sleep may be caused by physiological factors, or possibly pathological factors such as calcium deficiency or colds. Adjustments can be made according to the underlying cause. Specific details are as follows:

1. Physiological Factors

If the baby's sleeping environment is too noisy or the temperature is excessively high, the baby may feel uncomfortable and thus toss and turn. Appropriately improving the sleep environment can help the baby return to normal sleep.

2. Pathological Factors

1) Calcium Deficiency

Calcium deficiency in babies can affect normal bodily functions and lead to restless sleep. Under a doctor’s guidance, medications such as calcium gluconate oral solution, calcium gluconate granules, or calcium carbonate D3 granules may be used for treatment.

2) Cold

If the baby shows symptoms of a cold, normal breathing may be affected, which in turn disrupts sleep. Medications such as amoxicillin granules, pediatric paracetamol-phenylpropanolamine-metaraminol granules, or pediatric cold granules may be taken as directed by a physician.

In addition to the above causes, indigestion, intestinal spasms, or acute gastroenteritis cannot be ruled out. Medications such as montmorillonite powder, compound bacillus subtilis granules, or live bacillus licheniformis granules may be used. Given the baby's young age and for health considerations, medical consultation at a hospital is recommended whenever illness occurs.