18mo old still taking two naps a day

Title. He typically wakes up a little bit after we do, but usually he's still a little sleepy when he wakes, so we'll make him some breakfast and then he'll take his morning nap around 10

Then, religiously, he takes a nap around 4:30pm, eats dinner, plays for a couple hours, then is out around 9pm. This is pretty religious for him but it's starting to worry me because I feel like many other toddlers at his age are down to one nap long before this age. We got his hb checked at his 18mo checkup and it was normal so I don't think it's an issue there (he used to be slightly anemic before we started supplementing with iron, and he was definitely more tired then).

Anyone else in the same boat?