Heidi Anne's Version of the Birds and Bees

Heidi Anne has started to tell people I'm pregnant. She wants a little sister more then she wants a puppy. Trust me she wants a puppy more then anything - apart from a baby sister. 
A little discussion on a car ride home after pre-school:

Me: "Heidi Anne, why are you telling people I'm going to have a baby?"

"Oh, because that's how you get a sister." (Now this explanation comes from a little blue eyed, sandy blonde haired girl with pig tails in her booster set in the back of the car). 

Me: "What do you mean that's how you get a sister?"

"Oh, that's easy. You see Momma, babies never come by surprise. Kids or other people say "I've gonna have a baby soon! or I'm having a little brother or sister." Then a Momma goes to the hospital. Then she screams because she wants her baby. Soon a nurse comes in with a baby that screams too, and the nurse says "Yeap, it's a match!" So finally, the mommy gets her baby and they come home."

Me: "Oh, Really." 

 "I talked it out with Zoey (her friend) and if I say you're going to have a baby one will magically come."

Me: "Hmmm, well Momma isn't going to have a baby." 

"Not yet...silly. But soon, it's magic." (Insert matter of fact head nod). 

You can't really argue with a four year old about magic now can you?