Figuring out the right amount of Tylenol (acetaminophen) for your baby or toddler can feel stressful — especially at 2am with a fussy, feverish child. This guide provides weight-based dosage information following standard pediatric dosing guidelines.
Quick answer: Acetaminophen is dosed at 10-15 mg per kilogram of body weight, given every 4-6 hours as needed, with a maximum of 5 doses in 24 hours.
For a personalized calculation based on your child’s exact weight, use our free dosage calculator.
Acetaminophen (Tylenol) Dosage Chart by Weight
| Weight | Age (approx.) | Dose | Infant Drops (160mg/5mL) | Children’s Liquid (160mg/5mL) |
|---|---|---|---|---|
| 6-11 lbs | 0-3 months | 40 mg | 0.4 mL* | — |
| 12-17 lbs | 4-11 months | 80 mg | 0.8 mL | 2.5 mL |
| 18-23 lbs | 12-23 months | 120 mg | 1.2 mL | 3.75 mL |
| 24-35 lbs | 2-3 years | 160 mg | — | 5 mL |
| 36-47 lbs | 4-5 years | 240 mg | — | 7.5 mL |
*For infants under 3 months, always consult your pediatrician before giving acetaminophen.
Quick Weight Lookup: Exact Tylenol Doses
Looking up a specific weight? Here are the most commonly searched weights with exact mL amounts for children’s liquid acetaminophen (160 mg/5 mL):
| Weight | Dose (mg) | Children’s Liquid (mL) |
|---|---|---|
| 18 lbs (8.2 kg) | 120 mg | 3.75 mL |
| 20 lbs (9.1 kg) | 120 mg | 3.75 mL |
| 22 lbs (10 kg) | 120 mg | 3.75 mL |
| 25 lbs (11.3 kg) | 160 mg | 5 mL |
| 30 lbs (13.6 kg) | 160 mg | 5 mL |
For a more precise calculation based on your child’s exact weight, use our dosage calculator. If your baby is around 6 months old, see our dedicated guide on acetaminophen dosage for 6-month-olds by weight.
Key Safety Rules
- Always dose by weight, not age — weight is more accurate
- Never exceed 5 doses in 24 hours
- Wait at least 4 hours between doses
- Use the measuring device that comes with the medication — kitchen spoons are not accurate
- Check the concentration — infant drops and children’s liquid may have different concentrations depending on the brand
When to Call Your Pediatrician
Contact your doctor if:
- Your baby is under 3 months with any fever (100.4°F / 38°C or higher)
- Fever persists for more than 3 days despite medication
- Your child seems unusually lethargic or difficult to wake
- You’re unsure about the dose for your child’s weight
Want structured guidance? TriageNest’s symptom triage walks you through age-specific questions and tells you exactly when to call your doctor, when to monitor at home, and when to seek immediate care.
What About Ibuprofen?
Ibuprofen (Motrin/Advil) is another option for children 6 months and older. Some pediatricians recommend alternating Tylenol and Motrin for persistent fevers. Check our Motrin dosage guide for weight-based ibuprofen dosing.
Related Guides
- How Often Can You Give Tylenol to a Toddler? — Detailed dosing frequency and safety rules
- Acetaminophen Dosage for 6-Month-Old by Weight — Specific guidance for younger infants
- When to Use a Fever Reducer vs. Let the Fever Run — Should you always treat a fever?
Frequently Asked Questions
How much Tylenol for an 18 month old?
An 18-month-old typically weighs between 20-27 lbs. For a 22 lb toddler (10 kg), give 120 mg — that’s 3.75 mL of children’s liquid (160 mg/5 mL). For a 25 lb toddler (11.3 kg), give 160 mg — that’s 5 mL of children’s liquid. Always dose by your child’s actual weight, not age. Use our dosage calculator for a personalized amount.
How much Tylenol for a 25 pound toddler?
A 25 lb toddler (about 11.3 kg) should receive 160 mg of acetaminophen per dose. That equals 5 mL of children’s liquid Tylenol (160 mg/5 mL). Give every 4–6 hours as needed, no more than 5 doses in 24 hours.
Should I dose children’s Tylenol by weight or age?
Always dose children’s Tylenol by weight, not age. Weight-based dosing (10-15 mg per kg) is significantly more accurate because children of the same age can vary widely in weight. Use a dosage calculator or chart based on your child’s current weight for the safest, most effective dose.
How much Tylenol can I give my 20 lb baby?
A 20 lb baby (approximately 9 kg) would receive about 120 mg of acetaminophen (Tylenol) per dose. That’s 1.2 mL of infant drops (160 mg/5 mL) or 3.75 mL of children’s liquid (160 mg/5 mL). Give every 4–6 hours as needed, maximum 5 doses in 24 hours. Use our dosage calculator for your child’s exact weight.
Can I give Tylenol to a baby under 3 months?
You should always consult your pediatrician before giving acetaminophen to an infant under 3 months old. A fever of 100.4°F or higher in a baby under 3 months requires immediate medical evaluation regardless of whether medication is given.
How often can I give my toddler Tylenol?
Acetaminophen (Tylenol) can be given every 4–6 hours as needed, with a maximum of 5 doses in 24 hours. Always wait at least 4 hours between doses and use weight-based dosing rather than age for the most accurate amount.
What is the difference between infant drops and children’s liquid Tylenol?
Infant drops and children’s liquid acetaminophen now typically have the same concentration (160 mg/5 mL), but infant drops come with a smaller syringe designed for more precise dosing in small babies. Always check the label on your specific product and use the measuring device that comes with it.
Can I give Tylenol to my newborn?
For infants under 3 months, you should always consult your pediatrician before giving any medication. A fever in a very young baby (100.4°F or higher) requires medical evaluation regardless of whether medication is given.
What if my child vomits after taking Tylenol?
If your child vomits within 15-20 minutes of taking the dose, you can generally re-dose. If it’s been more than 20 minutes, the medication has likely been absorbed. When in doubt, call your pediatrician.
How long does Tylenol take to work?
Acetaminophen typically starts reducing fever within 30-60 minutes and peaks at about 2-3 hours. It usually lasts 4-6 hours.
This article provides general guidance based on standard pediatric dosing practices. It is not a substitute for your pediatrician’s advice. For personalized symptom assessment and medication guidance, try TriageNest free.
