Body parts and why we have them

So to see what my 4yr olds idea of why we have each body part I asked
me- "Kelsi why do we have arm pits?"
Kelsi- "for ticklin'"
me- "and foreheads?"
Kelsi "for bangs"
Me- "and why do we have hair?"
Kelsi "for clippies"
Me "Why do we have butts?"
Karli "for poopin'"
Kelsi "and farts"
Me "karli why do we have fingers?
Karli "because........and I have a little pinky"
Me "why do we have boobs?"
Kelsi "for feeding babies" Karli "and ME"