If you are matter of fact, kids don’t question shit. Case in point:
I’m observing bathtime. Snort splashes water in Coco’s eyes.
Coconut: OW. My EYES. Ow, Mama, ow!
Me: Are you okay? I can’t touch you right now, my hand is dirty.
Snort: What is that little cup?
Me: Every now and then, grown up ladies have blood come out their vaginas. So I use this little cup to catch the blood.
Coconut (who has been listening and totally calm and fine): Oh, okay.
Coconut: MY EYES!!