@xiaobin.wu7: Why do children need vitamin D3? After two activation steps in the liver and kidneys, vitamin D₃ enhances calcium absorption in the intestines, supports bone growth plates, and helps regulate the immune system.Its sources include sunlight exposure, foods, and supplements — absorption is better when taken with a meal containing fat. #ChildHealth #ParentingTips #3danimation #parenting #HealthTok