guppy fry all females??

[B20luda]

my female guppy recently had 18 fry they are about a month old...and none of them appear to be females...i had a very small batch before that (only 4) and they are all females also...all fish are doing fine but why are they all females?? they all have small gravid spots and are not very colorful..any ideas...

 

[colegamby]

it takes awhile for the sexes to develope in the fry. give it some more time and you will see some turn to male