well going from growth, i would say a female, i was allways taught that females are buisy, ie lots of growth. and males are lazy, not so much growth. but im notesing with my led lights up real close to the plant tops that growth is verry good on all seedlings, as the chances of them all being female are low, its the closeness of the light causing great growth. wait till you notice something growing behind those green spikes, then you can be 100% sure if you got a lady or a man