sexing young chickens HELP!!!!!

[Holdens farm]

my son has 20 young chickens ranging from 2 months to 3 months old. we can not seem to tell which are pullets or cockerels. some are easy to tell but some we can not seem to decide. does anyone have an idea for this???? thanks

 

[NottinghamChicks]

This can be somewhat helpful

http://www.ithaca.edu/staff/jhenderson/chooks/sexingchicks.html

 

[NonnasBabies]

You can try posting some pics of the ones your not sure but by that age it's usually not hard to tell what is what!!

 

[cmom]