Ibuprofen dosing for kids varies according to weight, explains WebMD. For example, children weighing 12 to 17 pounds may take 50 milligrams of ibuprofen, and children weighing 18 to 23 pounds may take 75 milligrams. Ibuprofen dosing charts are available on several websites, including WebMD.com, Parents.com and Motrin.com.
For accurate dosage, it is best to measure liquid ibuprofen with a syringe or dropper, notes St. Louis Children's Hospital. Children may take ibuprofen every six to eight hours but must not exceed four doses in 24 hours, according to WebMD. Children who weigh less than 12 pounds or are younger than 6 months old should not take ibuprofen unless directed by a doctor. Doctors recommend adult dosing for children 96 pounds and over.