Honesty is still the best policy.

So a few short weeks after Katie was born I was getting dressed after showering when Lillie walked in to get dressed herself.  She looked over at my stomach and says in a mildly disgusted voice, "What are those?" I explained "those" are stretch marks and most women get them when they are pregnant.
"Good, because you have 1,2,3....like a thousand."
"Yes, dear. Thank you."
"How long will you have them?"
"Oh....forever.  They will get lighter but probably wont ever go all the way away."
Of course I added because she told me I had a thousand I wanted to be honest with her;  "That is just the way things are, you will get them when you grow up and have babies too (hee hee hee).
If kids can be so honest, why can't I?