I accidentally kissed my 2 weeks old baby with a cold sore. i know to watch for symptoms, is there anything else proactive i can do?

Keep breastfeeding: If a lip sore is freshly oozing, there are lots of viruses there. If it hasn't broken open, or has already scabbed, there is less chance of viral transmission. Since Herpes-1 virus infections happen to the great majority of people, it is extremely hard or nearly impossible, to prevent oneself from being infected during one's lifetime. A baby can be examined if he gets blisters or behaves sickly.