DS is 21 month old now, and I started giving him vitamins when he was 19 months. He was going through a picky phase. I use the Flintstone vitamin and I give it to him one every other day, because a number of things on it was supposed to be 150%. Those vitamins were recommended for age 2 and above. DS also takes Calcium chewable because he was going through a phase where he would not drink milk but he is getting better about that after DH relented to add Ovaltine to his milk.