Toddlers are just insane little people. Their brains are capable of complex problem solving, but they don't have enough information to deduce from, so they just make shit up that fills in the gaps. Kind of like when people in a psychotic break will just adapt new information into their delusions. It's all part of growing up and learning, but it can be funny as fuck as an adult listening to the insane ramblings of a 3 year old.