Well, if your plants are 7 weeks old and only 5 inches tall you've done something to them. No plant is that slow growing naturally. If you've cut leaves off this may go some of the way to explain it. The plant will be trying to heal where you cut, so it basically says "fuck growing" and focuses on undoing some of the damage you did. Dont cut leaves.

Make sure the light isnt too close, try moving it away so it start to stretch upwards [not uncontrollable stretching]