Infant Tylenol Dosage Calculator
Look up the infant acetaminophen dose by weight for babies 3 months and older, with safety rules for fever in young babies. Example: a 14 lb (6.4 kg) baby has a label dose of 2.5 mL of the 160 mg per 5 mL liquid.
Show steps
How to use the Infant Tylenol Dosage Calculator
- Enter the values in the fields.
- Press Calculate to see the result with the steps shown.
Formula and method
Infant dose (mg) = weight (kg) x 10 to 15 mg/kg every 4 to 6 hours, up to 5 doses in 24 hours. Volume (mL) = dose (mg) / 32 for 160 mg per 5 mL.
Infant Tylenol dosage by weight (160 mg/5 mL)
| Weight (lb) | Weight (kg) | Dose |
|---|---|---|
| 12 to 17 lb | 5.4 to 7.7 kg | 2.5 mL |
| 18 to 23 lb | 8.2 to 10.4 kg | 3.75 mL |
| 24 to 35 lb | 10.9 to 15.9 kg | 5 mL |
Fever in young babies
| Age | What to do for a rectal temperature of 100.4 F (38 C) or higher |
|---|---|
| Under 3 months | Call your doctor or go to the emergency room right away; do not give medicine first |
| 3 to 6 months | Call your doctor, especially if 102 F or higher or your baby seems unwell |
| 6 months and older | Treat for comfort and call if fever lasts over 3 days |
How to give it
Use the syringe that comes with the bottle. Place it in the cheek, squirt slowly and let your baby swallow between squirts. Never mix into a full bottle where leftovers may be missed.
Warning signs
Hard to wake, trouble breathing, no wet diapers for 8 hours, a rash that does not fade, or a stiff neck need urgent care. This calculator is for education and is not medical advice. Always read the product label, use the dosing syringe that came with the medicine, and call your pediatrician or Poison Control (1-800-222-1222 in the US) if you are unsure.
Frequently asked questions
How much infant Tylenol can I give?
Use the label chart by weight, usually 1.25 to 3.75 mL for babies under 24 lb.
What if my baby is under 3 months?
Call the doctor first.
Is infant Tylenol different from children’s?
Since 2011 both are 160 mg per 5 mL in the US.
Can I give Tylenol and ibuprofen together?
Only if your pediatrician says so.
What is a fever in a baby?
100.4 F (38 C) or higher by rectal reading.
When should I call the doctor?
For any fever under 3 months or a fever that lasts over 3 days.
Sources
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