Infant Tylenol Dosage by Weight: The 9-Band Chart and the Under-2 Catch

Quick Answer: Infants’ Tylenol and Children’s Tylenol liquid are the same strength, 160 mg in each 5 mL, a change the FDA announced on 22 December 2011 (the old infant drops were 80 mg/0.8 mL). The Infants’ Tylenol label itself gives only one dose, 5 mL for 24 to 35 lb (2 to 3 years); for children “under 24” lb and “under 2 years” it says “ask a doctor”. The American Academy of Pediatrics (AAP) chart below adds doctor-guided amounts for younger babies: 1.25 mL for 6 to 11 lb, 2.5 mL for 12 to 17 lb, 3.75 mL for 18 to 23 lb, and states that acetaminophen “should not be given to children under two years of age without the guidance of a doctor.” Use weight before age, give a dose every 4 hours while symptoms last, and never more than 5 doses in 24 hours. A fever in a baby’s first 12 weeks needs immediate medical attention, not a dose chart. We do not link to any product on this page.

Search for an infant Tylenol chart and you will find dozens, most copied from one another. This page reproduces one table only, the AAP’s own, exactly as it publishes it, and sets it next to what the box in your cabinet actually says. The two agree for every child aged 2 and over. For babies under 2 they differ in one important way, and that difference is the reason to read this before you measure anything.

The AAP acetaminophen dosing chart by weight

This is the AAP’s acetaminophen dosage table for fever and pain, from HealthyChildren.org (last updated 30 January 2026), transcribed exactly. Find your child’s weight first; use the age column only if you do not know the weight. A dash means the AAP gives no dose for that product at that size.

* Under 2 years, only with a doctor’s guidance. The AAP chart’s own heading says: “Acetaminophen should not be given to children under two years of age without the guidance of a doctor.” The Infants’ Tylenol label gives no dose below 24 lb or under 2 years and says “ask a doctor”.

The chart’s header also sets the limits that apply to every row: “For products labeled for children and infants, DO NOT GIVE MORE THAN 5 DOSES IN 24 HOURS. For children over 12 years, extra strength tablets/gelcaps can be given every 6 hours. DO NOT GIVE MORE THAN 6 EXTRA STRENGTH TABLETS/GELCAPS IN 24 HOURS.”

What the Infants’ Tylenol label actually says

The Drug Facts label for Infants’ Tylenol (Kenvue, the current version on the National Library of Medicine’s DailyMed database, published 7 August 2026) has a dosing chart with exactly two rows:

That is the inversion behind the product’s name. The bottle marketed for infants carries no infant dose on its label at all. Its only printed dose is for a toddler of 24 to 35 lb, and it is the same 5 mL the Children’s Tylenol label gives for that weight. For a baby, the dose has to come from your child’s doctor, and the AAP chart above is the reference many doctors use when they give one.

Other directions on the same label, quoted:

• “find right dose on chart. If possible, use weight to dose; otherwise, use age.”
• “repeat dose every 4 hours while symptoms last”
• “do not give more than 5 times in 24 hours”
• “Attention: use only enclosed syringe specifically designed for use with this product. Do not use any other dosing device.”

Infants’ or Children’s Tylenol: the same medicine since 2011

Until late 2011 the two were different strengths, which is where much of the old advice online comes from. The FDA’s question-and-answer page puts it plainly: on 22 December 2011 “an additional concentration of liquid acetaminophen marketed for ‘infants’ (160 mg/5 mL) became available at local stores. Until then, liquid acetaminophen marketed for ‘infants’ was only available in 80 mg/0.8 mL or 80 mg/mL concentrations.”

The AAP’s table notes describe what followed: in 2011 the FDA “recommended liquid, chewable, and tablet forms of acetaminophen be made in just one strength,” and manufacturers “voluntarily worked to change the amount of acetaminophen in these medicines to one standard amount (160 milligrams [mg]). Liquid syrup acetaminophen is available as 160mg/5mL.”

Both current Kenvue labels confirm it. Infants’ Tylenol: “Active ingredient (in each 5 mL) Acetaminophen 160 mg.” Children’s Tylenol: “Active ingredient (in each 5 mL) Acetaminophen 160 mg.” The difference between the two boxes today is the device: the infant product comes with an oral syringe, the children’s product with a dosing cup.

Two practical consequences follow:

• Old charts written for drops are wrong for today’s bottles. A chart that gives infant doses in fractions of a dropper was written for the 80 mg/0.8 mL concentration, which carried twice as much acetaminophen per mL as today’s 160 mg/5 mL.
• Do not swap devices. The FDA: “Dosing devices sold with different products should never be interchanged. Droppers measure different volume of medicine compared to oral syringes.” If you find an old bottle of drops, the FDA says to read its Drug Facts label carefully and use only the device that came with it.

Why weight beats age

Both sources say the same thing. The label: “If possible, use weight to dose; otherwise, use age.” The AAP: “Use your child’s weight to decide on the right amount. If you do not know your child’s weight, use your child’s age.”

The age column is only a stand-in for typical weight, and children do not all grow at the same rate. Where the two point to different rows, the weight row is the one both sources tell you to use. A 2-year-old who weighs 22 lb, for example, falls in the 18 to 23 lb row, which is a doctor-guided band under both the AAP chart and the label’s “under 24” lb line, even though the child’s age alone would point to the 24 to 35 lb row. If you are unsure of your child’s current weight, the AAP adds: “Be sure to check with your child’s doctor to make sure you are giving the right amount.”

The measuring problem: 84.4% of parents made an error

Getting the right number off the chart is only half the job. A randomized experiment published in Pediatrics in 2016 (Yin and colleagues) gave 2,110 English- or Spanish-speaking parents of children aged 8 or under a set of labels and dosing tools, and asked each to measure 9 doses (2.5, 5 and 7.5 mL, with a cup and two kinds of syringe). The results:

• 84.4% of parents made at least one dosing error (more than 20% off the intended dose).
• 21.0% made at least one large error, defined as more than twice the dose.
• Errors were more likely with cups than syringes (adjusted odds ratio 4.6), especially for smaller doses.
• A teaspoon-only label was linked to more errors than labels and tools in millilitres only (adjusted odds ratio 1.2).

The authors concluded that “recommending oral syringes over cups, particularly for smaller doses, should be part of a comprehensive pediatric labeling and dosing strategy to reduce medication errors.” The AAP gives the same advice: “An oral syringe is the most accurate way to measure and give your child liquid medicine,” and “Never use a kitchen teaspoon or tablespoon.” If your product has no syringe, the AAP says to ask your pharmacist for one.

How often, and the maximum in 24 hours

• Interval: the label says “repeat dose every 4 hours while symptoms last”. The AAP: “For children under 12 years, give every 4 hours while symptoms last.”
• Maximum: “do not give more than 5 times in 24 hours” (label); “Do not give more than 5 doses in 24 hours” (AAP).
• Other medicines: the label’s liver warning says “Severe liver damage may occur if your child takes more than 5 doses in 24 hours, which is the maximum daily amount” or “with other drugs containing acetaminophen”, and adds “Do not use with any other drug containing acetaminophen (prescription or nonprescription).” Many cold and flu products contain acetaminophen, so check every label in use.
• Combination products: the AAP says “It is best not to give medicines with more than one ingredient to children less than 6 years of age.”

Keep a written note of the time and amount of each dose, especially when more than one adult is giving medicine. The 5-dose limit is easy to pass when two people each think they are giving the first one.

When to call the doctor instead

The AAP is explicit about the youngest babies: “Fever in the first 12 weeks may signal a serious infection and needs immediate medical attention; your baby will need to be checked in a health care setting to see what tests are needed.” It adds that “for children under 2 years, it’s generally recommended to check with your doctor before giving acetaminophen to ensure correct dosing and safety,” and that if fever follows a vaccine, you should talk to your child’s doctor.

The label lists when to stop and ask a doctor: if “pain gets worse or lasts more than 5 days”, “fever gets worse or lasts more than 3 days”, “new symptoms occur” or “redness or swelling is present”, adding: “These could be signs of a serious condition.” It also says to ask a doctor before use if your child has liver disease, and a doctor or pharmacist if your child takes the blood thinner warfarin.

If you think your child has had too much, the label’s overdose warning is to “get medical help or contact a Poison Control Center right away. (1-800-222-1222)”, and it notes that “Quick medical attention is critical for adults as well as for children even if you do not notice any signs or symptoms.”

Older children and teenagers

From the AAP chart and notes: For adult products, our adult Tylenol dosage chart quotes the Regular Strength, Extra Strength and 8 HR labels.

• Children’s chewables (160 mg) start at 1 tablet for 24 to 35 lb and rise to 3 tablets for 72 to 95 lb.
• Dissolvable powder packs “are available for children ages 6–11 years old and 48–95 pounds”.
• “Do not give 500 mg oral extra strength products to children under 12 years of age.”
• “Do not give 650 mg oral extended-release products to children under 18 years of age.”
• “Disintegrating tablets and suppositories are not recommended for use in children (unless directed by a doctor).”

If your child is vomiting and a suppository is the option, its box uses a different, age-based chart: see our acetaminophen suppository (Acephen) dosage page.

Frequently Asked Questions

How much infant Tylenol can I give by weight?

The AAP chart lists 1.25 mL for 6 to 11 lb, 2.5 mL for 12 to 17 lb, 3.75 mL for 18 to 23 lb and 5 mL for 24 to 35 lb, all of the 160 mg/5 mL liquid. Below 24 lb or under 2 years, both the AAP and the Infants’ Tylenol label say to get a doctor’s guidance first.

Why does the Infants’ Tylenol box say “ask a doctor” for babies?

The current label’s chart gives a dose only for 24 to 35 lb (2 to 3 years) and lists “under 24” lb and “under 2 years” as “ask a doctor”. The AAP likewise says acetaminophen should not be given under age 2 without a doctor’s guidance.

Are Infants’ Tylenol and Children’s Tylenol the same?

The liquid is the same strength in both, 160 mg in each 5 mL, since the FDA-announced change in December 2011. The packages differ in the measuring device: an oral syringe with the infant product, a cup with the children’s product. Use only the device that came in the box.

How often can I give infant Tylenol?

Every 4 hours while symptoms last, and no more than 5 doses in 24 hours, according to both the label and the AAP.

Should I use my baby’s weight or age?

Weight. The label says “If possible, use weight to dose; otherwise, use age,” and the AAP says to use age only if you do not know the weight.

Can I give Tylenol to a newborn with a fever?

The AAP says fever in the first 12 weeks “may signal a serious infection and needs immediate medical attention,” with the baby checked in a health care setting. Call your child’s doctor rather than dosing from a chart.

What if I gave too much?

Contact Poison Control at 1-800-222-1222 or get medical help right away, even if your child seems fine. The label says quick medical attention is critical even without signs or symptoms.

Can I use a kitchen spoon to measure?

No. The AAP says never to use a kitchen teaspoon or tablespoon, and the label says to use only the enclosed device. In the 2016 Pediatrics experiment, cups produced more errors than syringes, especially for small doses.

The Bottom Line

Today’s Infants’ and Children’s Tylenol liquids are the same 160 mg/5 mL medicine, so the AAP’s single chart covers both. From 2 years and 24 lb up, the label and the AAP agree dose for dose. Below that, the box you bought says “ask a doctor”, and the AAP’s 1.25, 2.5 and 3.75 mL amounts are meant to be given with a doctor’s guidance, not instead of it. Dose by weight, measure with the syringe that came in the box, keep to every 4 hours and no more than 5 doses a day, and treat any fever in a baby under 12 weeks as a reason to call, not to measure.

This page is general information, not medical advice. Follow your child’s doctor’s instructions where they differ from any chart.

Sources

1. American Academy of Pediatrics, HealthyChildren.org. Acetaminophen Dosing Tables for Fever and Pain in Children. Last updated 30 January 2026; source: AAP Council on Quality Improvement and Patient Safety, Committee on Drugs and Committee on Practice and Ambulatory Medicine. Dosing table (weight, age, product, dose) transcribed exactly; “Acetaminophen should not be given to children under two years of age without the guidance of a doctor”; “DO NOT GIVE MORE THAN 5 DOSES IN 24 HOURS”; 2011 single-strength change to 160 mg; “Use your child’s weight to decide on the right amount”; oral syringe advice; fever in the first 12 weeks; extra strength and extended-release limits. healthychildren.org; printable chart: AAP PDF. Checked 11 October 2026.
2. Infants’ Tylenol (acetaminophen) suspension, Kenvue Brands LLC. Drug Facts label, DailyMed set ID 997b9551-c222-4a9c-8ba1-09a5f97495fa, published 7 August 2026. “Acetaminophen 160 mg” in each 5 mL; chart “under 24 / under 2 years / ask a doctor” and “24-35 lbs / 2-3 years / 5 mL”; “repeat dose every 4 hours while symptoms last”; “do not give more than 5 times in 24 hours”; “use only enclosed syringe”; liver warning; stop-use list; Poison Control 1-800-222-1222. DailyMed. Checked 11 October 2026.
3. Children’s Tylenol (acetaminophen) suspension, Kenvue Brands LLC. Drug Facts label, DailyMed set ID 3162733b-9382-39f1-e063-6294a90ac420, published 16 June 2026. “Acetaminophen 160 mg” in each 5 mL; chart 24-35 lbs 5 mL, 36-47 lbs 7.5 mL, 48-59 lbs 10 mL, 60-71 lbs 12.5 mL, 72-95 lbs 15 mL, under 24 lb / under 2 years “ask a doctor”; “use only enclosed dosing cup”. DailyMed. Checked 11 October 2026.
4. US Food and Drug Administration. Questions and Answers: Important change in concentration for over-the-counter (OTC) liquid acetaminophen marketed for infants. 22 December 2011 availability of 160 mg/5 mL; earlier 80 mg/0.8 mL or 80 mg/mL; “Dosing devices sold with different products should never be interchanged.” fda.gov. Checked 11 October 2026.
5. Yin HS, Parker RM, Sanders LM, Dreyer BP, et al. Liquid Medication Errors and Dosing Tools: A Randomized Controlled Experiment. Pediatrics, 2016;138(4):e20160357. PMID 27621414. 2,110 parents; 84.4% made at least one dosing error, 21.0% at least one large error (more than twice the dose); cups vs syringes adjusted odds ratio 4.6; teaspoon-only labels adjusted odds ratio 1.2. Checked 11 October 2026.