I wouldnt worry about it man, when I began my current crop I started 2 from seed and vegged them til they had 4 nodes in about 4-5 inches. I would suggest making sure that theres at least 4 nodes of mature leaves (5+ sets). Mine were a bit leafier, but it probably has to do with genetics. Since I started flowering, they about tripled in size over 3 weeks and ill probably start LST on them next week to keep them down. Like Shiresmoker said, you can always top them too!