Children’s and infants’ needs are different—and so are their medicines
Because it’s more difficult to get medicine in an infant’s mouth, infant medicines are more concentrated than children’s—as much as three times more concentrated than children’s formulas. So if you give infants’ medicine to a child using anything other than the dropper that came with the product, you could risk giving too much.

Use the Fever Diary to help you keep track of dosage and how often your child gets medicine. More

There are no dosing instructions for children under two on the label. You must talk to your doctor.