Poy Sang Long

Poy Sang Long (Shan: ပွႆးသၢင်ႇလွင်း; lit. "Festival [of the] Crystal Sons") is a rite of passage ceremony among the Shan peoples, in Myanmar and in neighbouring northern Thailand, undergone by boys at some point between seven and fourteen years of age. It consists of taking novice monastic vows and participating in monastery life for a period of time that can vary from a week to many months or more. Usually, a large group of boys are ordained as sāmaṇera (novitiate monk) at the same time.

In neighbouring Thailand, where Shan immigrants have brought over the traditions from Myanmar, the ceremony goes on for three days, as the boys (dressed like princes in imitation of Gautama Buddha, who was himself a prince before setting out on the religious path) spend the entire time being carried around on the shoulders of their older male relatives. On the third day, they are ordained, and enter the monastery for a period of at least one week, and perhaps many years.

...
Wikipedia