Infant & Baby Tylenol Dosage by Weight (Pediatrician's Chart)

Infant Tylenol is generally safe for babies 3 months and older who weigh at least 12 pounds. Give 10 to 15 mg per kilogram of body weight, every 4 hours as needed. Do not exceed 5 doses in 24 hours. Under 3 months, any fever needs pediatric evaluation before any medication. Use the weight-based chart below to find the right amount for your baby.

In our telehealth visits, "How much Tylenol can I give my baby?" is one of the most common late-night messages we get. Below, a pediatrician walks you through the exact dose by weight, how to give it safely, and when to call your doctor instead.

What Is Baby Tylenol (Infant Acetaminophen)?

Baby Tylenol is a brand-name pain reliever and fever reducer for infants and children. Its active ingredient is acetaminophen (also called paracetamol outside the U.S.).

Acetaminophen is one of the most-studied medicines in pediatrics. It lowers fever and eases mild to moderate pain. It is sold over the counter without a prescription.

"Tylenol" is the best-known brand, but generic store-brand acetaminophen works just as well. The FDA requires generics to have the same active ingredient at the same concentration. There is no difference in safety or effectiveness.

Parents most often use baby Tylenol for fever, teething pain, post-vaccine fussiness, and pain from ear infections. It comes as a flavored liquid, measured with an oral syringe. For a fuller walkthrough of fever itself — from taking a temperature to knowing when it's an emergency — see our baby fever guide.

When Can You Give a Baby Tylenol?

Acetaminophen is generally safe for babies 3 months (12 weeks) and older, at the right weight-based dose. Under 3 months, do not give it at home.

Most pediatricians follow these guidelines:

• Age minimum: 12 weeks (3 months). For any fever in a baby under 3 months, call your pediatrician right away.
• Post-vaccine exception: Some pediatricians may recommend acetaminophen for babies as young as 8 weeks after their shots. Give it only when your pediatrician directs it, and at the exact dose they specify.
• Common uses: Fever, teething pain, post-vaccine soreness, and pain from ear infections.
• When not to give: Babies under 12 weeks (without doctor guidance), children with known liver disease, or anyone with an allergy to acetaminophen.

Do not give acetaminophen before a vaccine as a preventive step. Studies show this can lower the immune response to the vaccine. Only give it after, and only if your baby seems uncomfortable.

Infant Tylenol Dosage by Weight

The right dose depends on your child's weight, not age. Use weight when you know it. Fall back to age only if you do not.

"Weight-based dosing is the medical standard for safety," says Dr. Melissa Tribuzio, MD, a board-certified pediatrician at Blueberry Pediatrics. "A big 4-month-old and a small 8-month-old should not get the same amount."

The standard strength for all infant and children's liquid acetaminophen is 160 mg per 5 mL. This has been the single standardized concentration since the FDA phased out the old, more concentrated infant drops in 2011.

Chewable tablets carry a choking risk for younger children. Only give a chewable if your child can chew and swallow solid food; otherwise, use the liquid.

For babies under 12 weeks or under 6 lbs, call your pediatrician before giving any acetaminophen.

How to Give Baby Tylenol Safely

Giving the right dose matters, but so does giving it the right way. Follow these steps every time.

• Use the oral syringe that comes with the product. Studies show syringes are more accurate than dosing cups for liquid medicine.
• Skip kitchen spoons. Teaspoons and tablespoons are not precise enough and can lead to dosing errors.
• Aim for the cheek. Squirt the liquid slowly toward the inside of your baby's cheek, not straight to the back of the throat. This helps prevent gagging.
• Wait at least 4 hours between doses.
• Never give more than 5 doses in 24 hours.
• Check other medicines for hidden acetaminophen. Many cold, flu, and cough products already contain it. Doubling up can lead to an overdose.
• Store between 68 and 77°F. Check the expiration date before each use.
• Keep it out of reach. A child-resistant cap is not a substitute for safe storage.

How Often Can I Give My Baby Tylenol?

You can give Tylenol every 4 hours as needed, up to a maximum of 5 doses in any 24-hour period. Do not exceed either limit.

This dose, interval, and 24-hour cap come directly from the AAP and FDA labeling for infant and children's acetaminophen. Sticking to the schedule protects your baby's liver, which is where acetaminophen is broken down.

If fever or pain is not controlled between doses, call your pediatrician before you give an extra dose or switch to another medicine. Do not double up on a missed dose. Not sure it's actually a fever? Our normal baby temperature guide covers the numbers by measurement method.

Infant Tylenol vs. Children's Tylenol: What's the Difference?

Infant Tylenol and Children's Tylenol are the exact same medicine at the exact same strength (160 mg per 5 mL). The only real difference is the measuring device in the box.

Infant Tylenol comes with an oral syringe for smaller, more precise doses. Children's Tylenol comes with a dosing cup. That is why Infant Tylenol often costs 2 to 3 times more per ounce. You are paying for the syringe, not a stronger formula.

Before 2011, infant drops were about 3 times more concentrated than children's liquid. Parents accidentally switching between products caused dangerous overdoses. The FDA standardized both to 160 mg per 5 mL to prevent these mistakes.

If you only have Children's Tylenol at home, you can safely use it for your infant. Measure with an oral syringe and dose by weight using the chart above. Ask your pediatrician if you are unsure.

Can You Alternate Tylenol and Motrin (Ibuprofen)?

No, not on your own. The AAP recommends using a single medicine (either acetaminophen or ibuprofen) for a given fever, not routinely alternating them.

Two reasons drive that recommendation:

• Alternating raises the chance of dosing errors. That means giving the wrong medicine, giving it too soon, or doubling up. The most common driver of alternating-regimen calls to Poison Control is caregiver dosing confusion, not the medicine itself.
• The temperature benefit is small. AAP guidance notes that alternating regimens can lower fever slightly more than a single medicine, but comfort and parent confidence, not the exact number on the thermometer, are the right outcomes at home.

Alternate only when your pediatrician has told you to and has written down a schedule. If they do:

• Remember ibuprofen (Motrin) is not safe for babies under 6 months. Only acetaminophen is an option below that age.
• Keep a written log of which medicine you gave and when.
• Do not alternate for more than 24 hours without checking back with your doctor.

Signs of Overdose and When to Call Poison Control

Call Poison Help right away if you think you gave too much Tylenol, even if your baby looks fine. Early acetaminophen overdose often has no symptoms.

The tricky part of acetaminophen overdose is that liver injury can take a day or more to show. Watch for these signs and call your pediatrician or Poison Help if you see them:

• First 24 hours: Often no symptoms, or mild nausea, vomiting, loss of appetite, or sweating.
• 1 to 2 days after: Nausea and vomiting may ease, but pain in the upper right belly, unusual sleepiness, or poor feeding can point to liver strain.
• After 2 days: Yellow tint to the skin or whites of the eyes (jaundice), extreme sleepiness, confusion, or a baby who is hard to wake.

Poison Help can walk you through what to do in real time. They will tell you if your baby needs to be seen in an emergency room. In our practice, we ask parents to call them first for any suspected overdose. Do not wait.

When to Call Your Pediatrician

Call your pediatrician (or start a telehealth visit) if any of these apply:

• Your baby is under 3 months old and has any fever at all (100.4°F or higher, taken rectally).
• Fever lasts more than 24 hours in a baby 3 to 24 months, or more than 3 days in a child 2 or older.
• Your baby seems very fussy, extra sleepy, is not drinking, or has fewer wet diapers than usual.
• Fever is 104°F or higher at any age.
• You are not sure of the right dose for your baby's weight.

If you gave too much Tylenol, call Poison Help (1-800-222-1222) first, then your pediatrician. For fever specifically in a baby under 3 months, our newborn fever guide walks through the age-based worry thresholds.

How Blueberry Pediatrics can help

A sick baby at 2 a.m. is stressful, especially when you are staring at a bottle and doing kilogram math in your head. Blueberry Pediatrics gives you around-the-clock access to board-certified pediatricians by message, phone, and video. We can confirm the right dose for your baby's weight and tell you if a fever needs to be seen. And we can answer the second question you did not know you had yet.

You do not have to guess alone.

FAQ

How much Tylenol can I give my baby?

The dose is 10 to 15 mg per kilogram of your baby's weight. Give it every 4 hours as needed, up to 5 doses in 24 hours. See the chart above for the exact mL amount. Always dose by weight when you know it.

Can I give my newborn Tylenol?

No. Do not give Tylenol at home to a baby under 3 months. The AAP does not publish a home dose for this age. Any fever in a baby under 3 months needs medical evaluation right away, not fever medicine at home.

How often can I give my baby Tylenol?

Every 4 hours as needed, and no more than 5 doses in any 24-hour period. Do not give an earlier or extra dose without calling your pediatrician first.

Can I give Tylenol without a fever?

Yes, if your baby is 3 months or older and clearly uncomfortable from teething, an ear infection, or post-vaccine soreness. The weight-based dose is the same as for fever.

What's the difference between Infant Tylenol and Children's Tylenol?

Same medicine, same strength (160 mg per 5 mL) since 2011. The only difference is the measuring device. Infant Tylenol comes with a syringe. Children's Tylenol comes with a dosing cup.

What if I gave too much Tylenol to my baby?

Call Poison Help right away at 1-800-222-1222. Do not wait for symptoms. Early overdose can look normal, and calling early gives your baby the best outcome.

Can I give my baby Tylenol and Motrin together?

Not on your own. The AAP recommends a single medicine for a given fever. Alternate only if your pediatrician has told you to and written down a schedule.

What are the signs of Tylenol overdose in babies?

Early overdose often has no symptoms. Later signs can include vomiting, upper-right belly pain, extreme sleepiness, poor feeding, or a yellow tint to the skin or whites of the eyes.

How much Tylenol for a 2-month-old?

Do not give Tylenol at home to a baby under 3 months. Call your pediatrician first.

How much Tylenol for a 4-month-old?

For a baby 12 to 17 lbs, give 2.5 mL of the 160 mg / 5 mL liquid. Confirm with your baby's actual weight.

How much Tylenol for a 6-month-old?

Dose by weight, not age. A 6-month-old commonly weighs 14 to 18 lbs — babies at 12 to 17 lbs take 2.5 mL, and babies at 18 to 23 lbs take 3.75 mL. See the chart above for your baby's exact weight.

How long does infant Tylenol take to work?

Usually 30 to 60 minutes to lower a fever or ease pain. If your baby is not more comfortable at that point, call your pediatrician before adding another dose.

What if my baby spits out the Tylenol?

If most of it came out within a few minutes, you can give the full dose again. If your baby swallowed part of it or vomited well after taking it, call your pediatrician or Poison Help before re-dosing.

Is generic acetaminophen as good as brand-name Tylenol?

Yes. The FDA requires generics to have the same active ingredient at the same strength. Generic infant acetaminophen works exactly like brand-name Tylenol at a lower price.

Sources

• American Academy of Pediatrics. Acetaminophen (Tylenol) Pictographic Dosing Chart (PDF).
• U.S. Food and Drug Administration. Important change in concentration for OTC liquid acetaminophen marketed for infants.
• America's Poison Centers / Poison Help. 1-800-222-1222: the national Poison Help line.
• Agrawal S, Khazaeni B. Acetaminophen Toxicity. StatPearls [Internet]. NCBI Bookshelf NBK441917 (revised 2024).