Forum:Ferb talking

we all know ferb barely ever talks, but why? ther has to be an explaination. maybe he only talks when he needs to because of what happened with his mom. the most hes ever talked in one episode was when he was trying to tell phineas he didnt make doofenshmirtzs lair, he said 6 lines in all (in the episode ready for the bettys). does anyone have any theories?