Cloning and Sexing advice

I've got some seedlings I need to sex sometime soon, want to take a clone off each and sex the clone (keep potential moms).

My question is this: Can you flower a a clone while it is still rooting, or will this be too much stress? I just want to see the sex then discard (no dodgy sentence intended).

Anyone have any experience with this?

Thanks

it'll take awhile for them to be big enough to take clones, you could flower them to determine sex then reveg till your ready to really start flowering