For your first yeast infection, you should go to your doctor/midwife. There are creams for that.
Yeast is an imbalance in the ph level of your *ahem* area. Babies can also get yeast infections in the form of diaper rash.
Yeast infections can itch and burn - they also can smell... Well, yeasty. Like bread or beer, kind of.
Anything that causes an imbalance in your ph can cause a yeast infection. Sex for some. Pregnancy. Child birth. Anything that can change it.
You don't have to post every post in both pregnancy and teen pregnancy. Most people read both. ;)