The other day, my 3years and 11 months daughter told me that she wants to see the baby inside my stomach.. then, she began to look inside my belly button hoping she could see the baby inside. It really made me laugh.
I explained to her, she couldn't she the baby there, because the baby is inside the stomach (womb, of course she wouldn't understand that, that's why I told her its in the stomach)
She always hug me and hold my stomach gently saying she loves the baby and that if the baby would see her, he/she would smile at her.
Young children are really curious, it's really hard to explain everything.