Hi Charly, Welcome to the Downs.
Here is a link to a similar discussion
Elvish Reproduction .
To make it short & Sweet, Elves mate and bear children the same way as humans do. They reach adulthood at the age of 50 and if they marry it is usually after the age of 100. Their children are born in the first few years of their marriage. An Elven pregnancy lasts 1 year, and it is not uncommon for the first child to be born on the parents 1st wedding anniversary.
Elves generally have fewer children than humans because the parents must give up a part of thier fea (spirit) for the creation of the new life.
Here's another link I found.
Elven Pregnancy
[ September 25, 2002: Message edited by: Raefindel ]