yes Dexter is absolutely right.... normally when the plant is double the size of the pot in height if it hasn't started drooping. if it starts to have droopy leaves under light and they wont rise its time to re-pot...re-pot in some nice biggish pots 3gal will do some nice fresh soil within 1hour they should be back to norm or better GET SOME FERTS good to start them off in there new homes..

its always best to start seedlings in small pots helps to get them more established
GOOD LUCK M8