Infants aged 4-6 months can only rely on vitamin D supplements.

Sources of vitamin D in human body: sunlight irradiates skin; Diet; Vitamin D fortification.

Due to the shortage of vitamin D in breast milk, when the baby cannot add supplementary food within 4-6 months, it cannot receive enough sunlight to irradiate the skin and can only rely on vitamin D supplements.

In order to prevent vitamin D deficiency rickets, in addition to receiving as much sunlight as possible, one vitamin D preparation acceptable to infants should also be selected.

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