What is the treatment for cold sore in children?

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Your baby seems to be on oxygen. You have not mentioned how old is the baby? For how long she has been in the hospital and are there any other problems with the baby. Or was she because she came into contact with a cold sore? Cold sore infection can sometimes lead to contamination of the mouth or lungs, occasionally other organs like brain, etc. It depends on the extent of the spread of infection and the severity.

Being a preemie (preterm birth) always puts babies at risk of disease. Your baby needs injectable antibiotic medication for the cold sores, for a specific duration depending on the extent. If vomiting is because of it, it will gradually subside. If she is spitting up due to other causes, which can happen on the premises, your doctor would explain that. The sores are painful, and some topical applications would be useful to relieve the pain. You can discuss the extant of infection with your treating doctor.