Baby In Board

While driving back from our weekend outing....

Fy: Dad. Why you drive so slow hah? (this kid got Lightning Mc Queen in his blood)

QQ: (answering on behalf of dad) Papa drive slowly because got baby in car. Actually, when got baby inside car, we need to put a sign "Baby In Car"
..... or "Baby In Board".

Fy: Or "Baby In Stomach" ......
      Papa, why you laugh -hah?