Sry wasnt done lol. I wanted to also add to see a pediatrician if i doesnt dissappear within a few days. Try to dab a little milk of magnesia or teething gep on it for pain. Avoid giving anything acidic. Sometimes they are caused by a food allergy or viral infection which is why u should monitor it. Take care
Can a baby get that if someone blows in the baby's mouth?
No, canker sores are not contagious. But a cold sore is and could happen if so.eone blew in ur mouth due to saliva contact.
Oh thank you didn't know that now im aware of it