Vitamin D drops for infants should be supplemented with different doses depending on the age of the month, about 300~350ug/d. The recommended dose for birth~6 months is 300ug/d. These doses are the physiological requirements.
The recommended dosage for birth to 6 months is 300ug/d, and for 6 months to 1 year is 350ug/d. These dosages are physiologic requirements, and if a vitamin D deficiency occurs, the dosage needs to be increased appropriately depending on the degree of deficiency.
Also, if the infant is on formula, be aware of the addition of vitamin D to the formula. There is a slight difference between male and female genders, with boys favoring more. In summer, the amount of sunshine is more, sunlight exposure to the skin, can be synthesized vitamin D, you can reduce the amount of supplementation in moderation.
If the baby has obvious symptoms of calcium deficiency, or growth and development significantly faster, in addition to supplementation of vitamin D, but also eat more calcium content of food, calcium tablets, high protein food, etc., specific to consult a professional doctor.