I'll Feed Esther, Mommy"

So, we were sitting around reading picture books before naptime and Adrian picked up Esther and laid her across his lap and started to pull up his shirt.  He said, "I'll feed Esther, Mommy."  I said, "You can't."  He replied, "Why not?  I have boobies."  I then had to explain to him that only mommies can feed babies and not boys!!  :)