Teaching my toddler about her body

Well, here we are for first time. I'm asking the Glow community because my fiancee and I can't agree on how to properly teach our toddler about genitals and her own body . She will be 3 years old in April, and we're trying for another. He says to call her private parts by the proper name like vagina and breasts. I say she's too young and will learn that when she's older, so I call it her woo-hoo and titties. I'd like the opinion of everyone that will give it on this topic. Thank you.