How is cod liver oil used to prevent rickets?

Patient's question:

Okay, here is the translation following your instructions:
Okay, how should I give him fish oil to prevent rickets? I used to take Icicle (Yike Xin), but I ate little and was afraid it wouldn't be effective, and I'm afraid of poisoning from long-term use. How is it generally appropriate to give children long-term supplements? Thank you!

Doctor's answer:

Hello, fish oil mainly contains vitamins A and D. The main function of vitamin D is to promote the absorption of calcium and phosphorus by the intestinal mucosa. Deficiency of vitamin D can lead to impaired calcification of bone tissue, resulting in rickets, which is characterized by irritability, excessive sweating, restlessness, and skeletal changes.
Recommendations:
1. Generally, a preventive dose of 400 units of vitamin D should be given daily starting from 2-3 weeks after birth and continued for 2-3 years. This is especially important for premature infants, twins, and children with factors that may lead to vitamin A and D deficiency, who may need additional supplementation of vitamins A and D.
2. After the age of 3, children's growth rate slows down, and their dietary variety and outdoor activities increase. Generally, additional supplementation of fish oil is not necessary.

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