Reading everyones post about your kids turning four or five makes me miss nursery* so much! Our ward here has maybe two kids in nursery... maybe four. When I taught nursery, I could have 20 on a Sunday and that would be normal. And I loved it! I loved all the kids so much. And when I lost focus of what was important and decided not to go to church anymore, the hardest part was leaving the kids. And I generally don't regret things, but I do regret that choice. Because of the kiddos.
* for those of you not of the LDS faith, 'nursery' is where the 18 month old kiddos go during sunday school. There's a manual with lessons in it and everything. Typically my lessons were telling the kids something like Jesus loves you! while passing out goldfish :]