How identify Betta fry gender

[Aniket]

Now 3 fry showing egg spot so definitely they are female. But remaining are small and haven't shown colour so can we identify with overall look of fry?
They are smaller than these 3 fry.

 

[Roden]

How old are they?

I believe you can begin to accurately sex them once they are 2-3 months old.

The males typically are more leaner, larger fins, have a beard, and of course will eventually not tolerate another male near them. Females will have a rounder and larger stomach typically with an egg spot. Although egg spots aren’t a certain indicator of gender either, the males can have false egg spots. So if possible it’s best to try and view the females ovaries to get a precise sex.