do you want a baby sister?

Reading a book Spot's Baby Sister with A. last night. :
her: " Oh Spotty has a baby sister..."
me: " Do you want a baby sister?"
her: " hmm"
me: "do you want a baby brother?"
her: " hm..."
me: " you know you have two big brothers, but would you want a little one too?"
her:" hm.....I want scooter!...yellow scooter!"
that's it, decision made...