DS (who is 3.5) likes to watch me go potty, today he came in while I was using the bathroom and AF happens to be here. Here's our conversation:
DS, pointing to my mama cloth: "What's that mommy?"
Me: "That is cloth to catch the blood"
DS (looking worried): "You bleed mommy?"
Me: "Yes, but it's ok. Mommy's bleed from their vaginas sometimes, it doesn't hurt"
DS: "Can I touch it?"
Me: "No, it's dirty blood, you shouldn't touch it"
Later that day DS took a shower with me, our shower conversation:
DS: "Mommy, where is your penis?"
Me: "I don't have a penis, I have a vagina. Boys have penises, girls have vaginas"
DS: "you have a gy-nah?"
Me: "Yes"
DS: "It bleeds?"
Me:
"Yes"
Before bed while DS was using the potty:
Me: "Good job going potty!"
DS: "My penis is bleeding"
Me: No, it's not bleeding. Penises don't bleed"
I'm not sure what else to tell him about AF, I can tell he's really trying to understand it. I'm just waiting for our next outing where I'm sure he'll tell everyone that mommy's gy-nah bleeds 
DS, pointing to my mama cloth: "What's that mommy?"
Me: "That is cloth to catch the blood"
DS (looking worried): "You bleed mommy?"
Me: "Yes, but it's ok. Mommy's bleed from their vaginas sometimes, it doesn't hurt"
DS: "Can I touch it?"
Me: "No, it's dirty blood, you shouldn't touch it"
Later that day DS took a shower with me, our shower conversation:
DS: "Mommy, where is your penis?"
Me: "I don't have a penis, I have a vagina. Boys have penises, girls have vaginas"
DS: "you have a gy-nah?"
Me: "Yes"
DS: "It bleeds?"
Me:
"Yes"Before bed while DS was using the potty:
Me: "Good job going potty!"
DS: "My penis is bleeding"
Me: No, it's not bleeding. Penises don't bleed"
I'm not sure what else to tell him about AF, I can tell he's really trying to understand it. I'm just waiting for our next outing where I'm sure he'll tell everyone that mommy's gy-nah bleeds 






: Jill!

: so they see the period. They like to get my mama cloth out and choose the pattern (ladybugs is a current favorite) and lay it into the underwear. They fight over who gets to do this
: ) "Yes, that's your clitoris!" No further discoveries to report at this time.
: I have gone through a similiar conversation with DS (though he's a year younger than your DS). he calls my cloth pads "mama's diapers" 
I was so shocked/mortified I couldn't say anything for a moment. And, of course the bathroom went dead quiet.
Periods have absolutely NOT been precursors, nests, or anything else, related to pregnancy for me.
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