Difficult questions for mummy

...some questions I can't seem to bring myself to answer.

Question 1:
When waiting for the lift at Ground floor of the apartment block...
Rachel: Mummy, why there's no down button? Why only up button?

Question 2:
She was struggling and pulling on the steering wheel of her toy car..
Rachel: Mummy, why my steering wheel not like daddy's steering wheel car one? (showing me why her steering wheel is placed horizontal, while daddy's one is near to vertical...)

Question 3:
Watching Barbie Thumbelina, and looking at the scene where the twirler-babies are born...
Rachel: Mummy, why the babies born, straightaway can sit one? Why Kenneth cannot sit when he was born one?

Question 4:
After explaining the use of the alarm button in the lift...
Rachel: Mummy, what if the lift does not work, when we are not in the lift, where's the alarm button outside the lift?

and a lot more coming, like bullets aiming at me.... headache, headache....