Yi Kexin suggested taking it to 2-3 years old. Yikexin is taken with calcium to promote calcium absorption, and it is not recommended to take it for a long time. Ickexin is a fat-soluble vitamin. Eating too much is not good for your baby. It is recommended to take your children out for a stroll and bask in the sun every day, so that you don't have to eat Ickexin, but you can eat it on rainy days.