If Winnie is considering about anesthesia and she wonders if newborns feel pain, I will respond in a way that she'll understand clearly and base on the research that newborns could feel pain. Even though they are too young or they are just newborns, it is still likely that they will feel pain because they are still humans who have senses and can feel emotions that would affect them.
Considering that they would come in contact with one another in the car, that would then be exposed to the disease as well. Since communicable disease can be passed on by direct contact.