The phrase "to contact the doctor" means to get in touch with the doctor, usually by calling or messaging, to ask for medical advice or make an appointment. Full definition
Contact your doctor immediately if you suspect you may suffer from this rare but serious condition. (parents.com)
You should — of course — always contact your doctor if you think your child is experiencing an allergic reaction to mango, or any other food. (homemade-baby-food-recipes.com)
If, after being exposed to a certain food, your baby develops swelling anywhere on his face, lips, tongue or throat, contact your doctor right away. (myorganicformula.com)