Is he nursing? You might be ok if he is. But yes, now that you know you are having an outbreak, be EXTREMLY careful around your baby.
My 2 year old caught Herpes Simplex 1 from my mother who had one nasty cold sore right on the tip of her lip. I told her to be careful, but he also had a cold at the time, so his compormised immune system was to weak. It was NASTY! Swollen gums, he could hardly eat anything and whined everytime he tired. Had a hard time drinking except out of a regular cup too. I felt so bad for the little guy. And my mother felt AWFUL!