If you have one sibling (brother or sister, but not both), you have a girl.
If you have more than one sibling (brother and sister, two brothers, etc.), you have a boy.
If you are an only child, you choose.
Name your child from here (pick any play):
http://www.cool-baby-names.com/search-categories-shakespeare.htm
Round 1:
http://www.behindthename.com/bb/arcview.php?id=769083&board=game