Ask most parents what their toddler's early words were, and body parts come up constantly, nose, ear, belly, toes, often before far more "useful" words. There's a simple reason body-part words tend to come early and stick: nothing else gets pointed at, touched, and named quite as often.
Why body parts have an unfair advantage
Vocabulary builds fastest around words that get repeated in real, physical context, not words that get repeated the most in isolation, like on a flashcard. A toddler's own body goes everywhere with them, gets touched constantly during dressing, bathing, and play, and is available for naming dozens of times a day without anyone setting up a special activity. That density of real, embodied repetition is exactly what makes a word stick.
A simple routine that works better than drilling
Instead of formal "teaching time," the highest-leverage moment is already built into your day: naming body parts out loud during things you're doing anyway. "Let's wash your hands." "Time to brush your hair." "Where are your socks going, on your feet!" The repetition comes from routine, not from flashcards, which is exactly why it works.
A useful next step once pointing starts working
Once a toddler reliably points to a named body part on themselves, the next real test, not the next drill, is whether they can find it somewhere else: on a doll, on you, in a picture. That transfer is what shows the word is genuinely understood, rather than memorized for one specific context.
First Words for How Things Work: My Body is built around exactly that progression, real photographed body parts, in the kind of varied context that helps a toddler's understanding actually transfer beyond the page.