help seedlings not growing

i have 2 seedling, both about 15 days old, and they seem totally healthy except for the fact they have not grown the slightest bit in 10 days. each have the cotyledons and the first pair of leaves, and are about 3" high. they are in my room, propped up against the window sill and are getting about 12 hours of sunlight each day. i've been using a scant amount of diluted urine as fertilizer, and rootspace isn't a problem. is it normal for the growth to stagnate like this? if not, what's going on?

 

Maybe if ya moved them down so they have t reach 4 the light that would help, turnin everyday help too untill they get too big. If ya using new soil then there shouldnt b a need t feed them 4 first month.

 

well, remember not to fert while they still have their first leaves...THOSE feed the plants. your piss is prolly stunting them.