It is recommended to stop giving your baby tomatoes or tomato-based products for now and observe if the symptoms continue. If the redness persists after a couple of hours, you can consider applying a mild hydrocortisone cream twice a day. It is also advised to reintroduce the food to see if the reaction occurs again in a few months to confirm if it is an allergy. If you have any further questions or concerns, it is best to consult a healthcare professional for guidance.