How old till you can tell the sex of an African Goose

[romanspoultry]

I'm hatching African geese to show in August, age doesn't matter at the show but I need two of the opposite sex. What age is the best to tell what the difference is? Is it possible to confirm when they're this young?

 

[Goosebaby]

It’s best to do it as young as possible.

This is how to sex goslings