A youth side lock was a plaited lock of hair which pre-pubescent ancient Egyptian youths, particularly boys, wore on the side of otherwise shaven heads. References show that boys would stop wearing the side lock once they had been circumcised

Circumcision

Male circumcision is the surgical removal of some or all of the foreskin from the penis. The word "circumcision" comes from Latin and ....

 around the age of fourteen years.

Ancient Egyptian art also shows children as nude with a finger held to the lip.