Guesstimating age?

Hi all, is there a way to guesstimate the age or year of birth of a bp by it's weight? anne b weights 1991g and i'm curious to know atleast what year she was born, she was adopted. any advice is appreciated. Thank you

bump, any ideas? or is it hard to tell?

Well its just almost impossible to know, but at that size I would thing your bp is at least 2 years old.