You don't need to delete your game and reinstall it. The trails will go away if you exit the game and launch it again. That's another bug that will be fixed in v1.1, and it's related to villager management in memory (as is the vanishing villager bug).
Also, I think if you'll check in your village, you'll see a little two-year-old running around. There is a delay in the removal of the "baby decal" from the mom when the baby is weaned. If you pick up the mom or she needs her hands for something during this time, the "baby" is removed. You didn't lose a villager this time!
