http://en.wikipedia.org/wiki/Culture_of_Mongolia#Customs_and_Superstitions:
>>Mongolians traditionally were afraid of misfortunes and believe in a variety of good and bad omens. Misfortune might be attracted by talking about negative things, or by persons that are often talked about. They might also be sent by some malicious shaman or enraged by breaking some taboo, like stepping on a yurt's threshold, desecrating waters or mountains, etc.[citation needed] The most endangered family members were children, and that's why they would sometimes be given non-names like Nergui (Mongolian: without name) or Enebish (Mongolian: not this one), or boys would be dressed up as girls.[5] Before going out at night, young children's foreheads are sometimes painted with charcoal or soot in order to deceive evil spirits that this is not a child but a rabbit with black hair on the forehead.
When passing ovoos on a journey, they are often circumambulated, and some sweets or the like are sacrificed, in order to have a further safe trip. Certain ovoos, especially those on high mountains, are also sacrificed to in order to obtain good weather, ward off misfortune and the like.
For a child, the first big celebration is the first haircut, usually at an age between three and five. Birthdays were not celebrated in the old times, but these days, birthday parties are popular.<<
This was true of many other cultures, not just the monglians, if you go back far enough into the history of civilization.
See photo of a group of Irish boys in skirts.
http://www.nationalgeographicstock.com/ngsimages/explore/explorecomp.jsf?xsys=SE&id=1319316AGRBear