Yes, you can give your child Motrin and Benylin together. However, it is important to consider the age of your child, any allergies they may have, their overall health (such as asthma), and their specific symptoms before giving them these medications. It is recommended to adjust the dosage based on weight (for Motrin) and age (for Benylin) as indicated on the manufacturer's instructions. If your child's condition worsens or if they have a fever for more than 72 hours, it is advisable to consult a doctor.