What's more confusing that physical chemistry? Quantum physics?

I'll tell you what. It's car seats. Thanks to our little guy being so enormous, we will soon be in need of a car seat upgrade. His seat is rated to 22 lbs, which he is not quite at yet, but his legs are long enough that he can easily press his feet flat against the backseat. However, Dr. Kira says he is not developmentally ready to sit forward-facing yet -- she says we need to wait until he is as close to 1 year as possible to give him all the time he needs to develop the head control that would help him if he were forward-facing in a car crash. And although Isaac seems incredibly proficient to me at his head-controlling, he is still not as solid as you or I. The answer? We must buy these ungodly-expensive convertible car seats, which sit rear-facing up to 30+ lbs, and then can be used up to 60 or even 80 lbs forward-facing.

I really don't understand how one is supposed to choose one of these. We got out of the car-seat-picking deal before by getting one from the hospital before we took Isaac home, so we've never even looked into them. It's almost like buying a car. You have your solid plastic ones, and then your plastic/"foam-inum" blends; you have your multi-position reclining ones; you have your ones with movable armrests, with cupholders, with lap bars. It is all way too much for anyone to understand, which means it is far beyond my capacities, as my case of mommy-brain is going into advanced stages. I am tempted to convince Dad that we need to buy him a Britax, which is like the Volvo of car seats -- guaranteed the safest in the world. These guys are ultra-pricey, but if it means I don't have to think about one more thing, that is WORTH IT to me at this point.