Yes, you can give Motrin and Benylin to a child, but it is important to consider the age and health conditions of the child before doing so. If the child is under 6 years old, it is not recommended to give them Benylin. It is also important to adjust the dosage according to the child's weight and age, as indicated on the packaging. If the child's condition worsens or if the fever persists for more than 72 hours, it is advisable to consult a doctor.