The amount of Tylenol (acetaminophen) to give an infant depends primarily on the infant's weight and age. Here are the general guidelines based on current pediatric recommendations for the common liquid concentration of 160 mg per 5 ml:

• For infants weighing 6–11 lbs (3–5 kg), give 1.25 ml (40 mg acetaminophen).
• For infants weighing 12–17 lbs (5–7 kg), give 2.5 ml (80 mg).
• For infants weighing 18–23 lbs (8–10 kg), give 3.75 ml (120 mg).
• For infants weighing 24–35 lbs (11–15 kg), typically ages 2–3 years, give 5 ml (160 mg).

Doses can be repeated every 4 to 6 hours as needed, but do not exceed 4 to 5 doses in 24 hours

. Additional important points:

• Do not give acetaminophen to infants under 3 months old without consulting a healthcare provider

• Use only the dosing device that comes with the product (syringe or dosing cup) for accuracy

• Always check the concentration on the package, as some infant drops may have different concentrations (e.g., 80 mg/0.8 ml vs. 160 mg/5 ml)

• Consult your pediatrician if you have any doubts or if your child is under 24 months or weighs less than 24 pounds

In summary, the dose is weight-based, measured carefully with the provided device, given every 4-6 hours, and not exceeding 4-5 doses per day. For infants younger than 3 months or very small infants, always seek medical advice before administration.