Vietnamese do not know or acknowledge the exact day they were born, everyone's birthday is celebrated on New Years day ("Tet" is the name for the first morning of New Years). A baby turns one on Tet no matter what day he or she was born on that year. On the first morning of Tet, parents, siblings, relatives and close friends congratulate children on becoming a year older by presenting them with red envelopes that contain "Lucky Money," or "li xi".