educating my older kids

I have a 9 year old and a 8 year old boy and girl and I'm pregnant with my third which is a boy due nov 17th anyways I had a talk with them today about were the baby comes out of  just in case they are with me when I go into labor and about breastfeeding because they thought it was only one way to feed a baby which was formula feeding but I'm planning on breastfeeding..I thought it was good to let them know because my parents didn't tell me any of this and nowadays kids are curious I rather for them to hear it from me then anyone else... Not important but felt like sharing.