Im breastfeeding and light period comes and goes away?

No unusual: While not unusual, a check up by your gynecologist is in order to rule out serious problems as well as things like a cervical polyp or even infections.

Hormone changes: Post pregnancy, especially if breast feeding, your hormones are at very different levels than at any other times. This makes your periods, if you even have them while breastfeeding, very different than what you are used to. Most of the time you are not ovulating if you are nursing full-time (natures way of spacing out your kids). So you may have some light, irregular breakthrough bleeding.