She needs proof!

Their mother was in labor, so we took the kids to the park when she and Dovid went to the hospital. A few hours later, their father called to tell us that that the baby was born--a boy! His big brothers were appropriately delighted, but T was busy playing in the sandbox so we didn’t say anything about the baby until later, when she asked, “When is Mommy coming home?”
I told her that Mommy was staying at the hospital for a while because the baby came out of her tummy.
“No it didn’t!” T insisted.
I guess she’ll just have to see the evidence for herself when Mommy comes home.