How much tylenol (acetaminophen) can i give my 9 month old in ml

Based on weight: It depends on his weight. Your best bet is to call a pharmacist or ask your doctor to make sure you don't give too much.

Tylenol (acetaminophen): If you feel baby is fussy, try giving some tylenol (acetaminophen) (160 mg/5 ml concentration) here is a good table: if 6-11 lbs or 0-3 months, give 1.25 ml; if 12-17 lbs or 4-11 months, give 2.5 ml; if 18-23 lbs or 12-23 months, give 3.75 ml; if 24-35 lbs or 24-35 months, give 5 ml;.