you might want to do something about those bugs chomping on your leaves like that!!! neem oil or something else organic. do some research you'll find something suitable.

Also find some bloom nutrients for flowering. Some that are lower in nitrogen and higher in phosphorus and potassium. Once you can tell sex and they stat flowering give them that. The fact that it is 3/4 months old and is only that tall I would assume you havent been feeding it?