I was cleaning and changing my nine month old daughter's diaper and noticed a thick yellow mucus discharge from her vagina. Is this normal? I only have boys, this is my first girl.
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Reasons For Discharge From Baby Girls' Vaginas
I wouldn't say yellow mucus froma 9 month girl's vagina is completely normal. If it continues, you should take her to a doctor to have her examined.
Female infants can have a discharge for different reasons:
For very young baby girls (younger than 3 months old) vaginal discharge is often related to hormonal changes during and after childbirth. For a baby as "old" as 9 months, hormonal changes are not a relevant explanation, though.
At 9 months, the discharge may be due to some infection.
Another possibiity could be if some little piece of paper or something else is stuck in her vagina and causes irritation. If she has been crawling around without diapers, then theoretically she can have sat down on something that got stack. (Far-fetched, maybe, but strange things do happen.)
You write that the mucus is thick and yellow. That does point to an infection. Even more so if the mucus is grainy. If it would have been like egg-white, you probably wouldn't have to worry at all. If you notice discharge several days and it seems to increase, that is a reason to talk to a pediatrician.
Other reasons to talk to the doctor are if the discharge smells bad or if you also find blood in the discharge. Also, if your daugther appears to be ill in anyway, of course consult her doctor.
Most likely she will be fine and it will go away on its own. You may want to take her just to get checked out by your pediatrician.