gender-bending already?

at bathtime this evening i was bantering with the bean when she came up with something truly unexpected.

it started out simple enough...
me: "are you a little girl?"
bean: "nooo" (she said, not really looking at me as she was playing in the bath)
me: "are you a baby?"
bean: "nooo"
me: "are you an aeroplane?" (she was playing with a toy plane then)
bean: "nooo"
me: "are you a bird?"
bean: "nooo"
me: "are you a butterfly?"
bean: "nooo"
me: "what are you then?"
bean: (turning to me) "boy!" and she beamed brightly.

hmmm, should i worry?
maybe it explains why she is so hooked on breastfeeding... n-aaahhhhh