When can i start giving my child tylenol (acetaminophen)?

Usually...: The first use of Acetaminophen is usually to treat or decrease fever, crying or swelling after a vaccine shot, which usually happens after 6 weeks of age. Fevers unrelated to vaccination are of greater concern in very young infants, since any infection can be serious in a child with an inexperienced immune system.

3 months: It's best to contact your pediatrician if you think you need to use tylenol (or any brand of acetaminophen) prior to 3 months. It's safe younger than that, but you need to be careful you're not missing something important.

After 2 months: Tylenol (acetaminophen) can be given to infants after they are two months old. Always check with your health care provider if your infant has a fever to determine whether they need to be evaluated.

After 2 months: Generally, tylenol (acetaminophen) infant drops may be used after age 2 months, but a parent should first confirm this with the doctor at the 6-8 week check-up.