
I have an evolutionary theory about the canines coming after the molars which I just made up 20 seconds ago.
See, waaaaaayyy back before most babies got molars then canines, some got the canines first and it was really easy and they didn't fuss and the baby didn't drive the parents crazy. But then later, other normal child stuff freaked the parents out and they left the kid for the wolves.
Thus wasting a lot of nurturing time and resources that could've gone to more reproduction.
And some babies got the molars first and the parents couldn't handle the screaming and the baby went to the wolves ASAP. They could reproduce sooner, but they weren't successful until they got over getting freaked out by teething.
Finally, there's the set of parents who dealt with the freaking out over teething a-okay and they kept the baby and the subsequent babies and their babies had babies and got through teething in one piece.
So basically, my theory is that the molars come first so we get lots of practice with irritable babies.

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