why her is short .. about 4cm

Ok so I've got some fastbuds going and they are doing better then your at same time ? Are you using nutes try not to till third week that's when I have my first 1/4 strength feeding to the girls ...when in soil it doesn't need nutes right away the colour of the plant looks like she was stressed that's for sure and to increase height raise the lights up mine a 300 watt led full spectrum was sitting 21-24 inches and they lived it.. try not to over water or over feed so much easier to recover from a lack of nutrients then the burn of over fertilizer and a good air circulation will help with vigorous growth hope this helps ..cheers