Help sexing IB Pied and a silver pied please

[Helen in the Desert]

Need help with sexing if anyone has any ideas at this point.
Flint was hatched about May 25th - trying to figure out how to upload the photos in a cohesive order...having to post in separate comments.
Birds are being hand raised by a friend of mine and she wants to keep a girl, so we are hoping at least one of these is leaning towards female. For now I think Frank is looking pretty girly. Have absolutely NO clue about Jesse. And the other two I'm not sure it's late enough to really tell.

 

[Helen in the Desert]

Shorty hatched around May 25th

 

[Helen in the Desert]

Frank hatched around May 10th

 

[Helen in the Desert]

AND Jesse, a silver pied spalding hatched about May 10th. First pic is its neck at the top and between the shoulders.

 

[KsKingBee]

Frank hatched around May 10th

This one looks like a hen to me, but it is way early for me to be definite on the others.

 

[Dany12]

When the brown feathers are grey/brown it's a female .