Re: [Featured] Shingeki no Kyojin by ISAYAMA Hajime
I'm not sure about the 3 meter class yet, there is still much that has not been revealed. Interesting idea about babies and children being turned into Titans though. It would not only explain the 3 meter class and deviants (children and teens), but also explain why some Titans act completely infantile. Very interesting idea.
The next question this theory raises is where all of the unintelligent titans come from. It seems fair to assume that most of the intelligent ones come from within the walls. Maybe not all, but at least a good percentage. But the unintelligent ones are to numerous to come from within, if that many people went missing someone surely would notice. And any of these titans would have to transform outside of the walls, as none would be coherent enough to let themselves out, like the female titan was able to do.
The Titan that ate Ilse is still a bit of an enigma. My best guess is he was at least intended to be an intelligent titan, like the Female, but was struggling to maintain his consciousness and identity. It is possible Ymir is the one who administered the serum, a leader of some sort. With no villains introduced it is a hard question to answer, but that is my best guess.