Friend 1 - has 2 DC, 7 and 5. Her DH has said "no more" (actually he only ever wanted 1 child). Constantly goes on about how much she just wants another baby and won't be fulfilled without ...
Friend 2 - also has 2 DC (9 and 4). DH is open to the idea of another child but they live in a 2 bed house and can't afford to move to something bigger. 3rd child clearly impractical. Friend is constantly hoping for a miracle that will expand the size of their house because she "needs" that 3rd child.
Now I understand that some women get broody occasionally; I understand how truly upsetting it must be if you are unable to have children at all. But ... for those who already have children and overriding reasons why they should not have more ... why do you really "need" that other child?