seedlings

was wondering i got like 7 seedlings going, is there anyway i can find out there sex before transplanting. i only know of forcing them and think they have to have 4 nodes not sure how big that really is offhand. but right now i have the in solo cups atmnot sure if that would be big enough for them to get big enough to sex? if anyone has any ideas, i just dont want to go through and transplant and manage to fit 6+ under my 400w set up and the have kill a few. sorry for asking a question that prolly has been asked alot.

I start my seeds in peat pods , I have grown in styrofoam cups, you should be able to tell sex within a month.I only transplant when plants are healthy and kinda dry soil

The only way is to force flower to determine sex.

ok cool thx for the info, my next batchs i plan on using rockwool cubes.