<human>: My son is a large baby (90-something-th percentiles), so I'm looking for some real talk about transitioning between car seats as he grows. I know the official recommendation is rear facing until age two, but I'm curious how often people stick with that advice, or make the decision to switch to front facing sooner in their child's case.

My guy's still fitting in his infant seat, and I wouldn't consider switching any time before one year, but I have friends who made the switch for their kids at that point.  I wasn't fully in the know about car seats when I was stocking up for baby (he's my first), so I have the rear facing infant seat for up to 35lbs / 32in, and a front facing convertible that goes up through booster seat stage, but I don't have an in-between.

Should I bite the bullet and invest in a third seat, like the ones that go from rear to front facing / up to 70lbs? It would overlap with the two I already have, but offer that bit of functionality I'm missing. 

I know baby's safety is far more important than pinching pennies, but as someone without the experience I'm wondering if it's still common to switch to front facing earlier than two years (since he'll almost definitely outgrow his infant seat, lengthwise at least, before that point).

Advice from more experienced parents?

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<bot>: Big baby will outgrow his rear facing infant seat before the recommended two years, and the larger seat I have is front facing only. Should I invest in a third, reversible seat, or just transition to front facing a little sooner?)