For example, maybe your child shared a cup, utensil, or slobbery toy with someone who has the infection.Or maybe he was kissed by someone with the virus in her saliva (whether or not the person had a visible sore).
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Cold sores themselves aren't dangerous, but it is possible for the virus to spread to other parts of the body – and that can be dangerous.
It's very unusual for a child to get a cold sore in the first six months or so of life, because the antibodies received from his mother offer some protection.
Babies can also get the herpes virus during a vaginal birth if their mother has genital herpes.
You can't transmit the virus to your baby by breastfeeding, though, even if you have an active cold sore.