Hilary Duff's son Luca can't keep his eyes open after a big day

Alex Nishimoto/CNETCar seat companies are constantly innovating and finding new ways to add versatility to something as seemingly basic as a seat. Most infant car seats are made up of a base and the seat itself, which can detach easily for use as a carrier or click into a compatible stroller. But the Maxi-Cosi Coral XP one-ups the competition with the ability to separate a third way for an even lighter wearable carrier. "We didn't play with fundamentals at first, but we adjusted in the second half, and took care of the ball a little bit. ... So we had a…