Board Thread:Manga/@comment-32563139-20170718093831

When someone is injected to become a titan, is their size random? Or is it based on how much fluid is injected. In the manga chapter 87, before injecting someone, Commander Gross says:

'I'll be sure to make him a three or four metre titan...'

So that makes me think its the amount of fluid injected OR maybe there are different types of titan serum, that turn people into different sizes of titans? What do you guys think? 