I just love reading about the different ways we all worship and learn. Neil is right, there is no one perfect way of doing anything, but here's how we do it.
Sundays we have three worship services.
The 8:15 am is a breakfast service in our Fellowship Hall. Although it is composed of more traditional elements, it is informal and very family friendly. (particularly very young children) Children (4 years old through 2nd graders)are dismissed right after the children's message, but before the sermon, to the Worship Center where we do Godly Play. They return as soon as the sermon is over to finish their worship as a family.
The same thing happens at 10:30 am (our more traditional service in the sanctuary) and the 5:00 pm contemporary service in the sanctuary as well.
We offer Sunday school for 2 year olds through adulthood at 9:15 for one hour. I do rotation with 1st through 5th grades only. There is Nursery care for infants through 3 years olds during all services and CE hour.
My ultimate goal? To have the children remain in service for the whole time, hopefully we are teaching them to that end.
There is talk of offering another education hour in the evening, either before or after the contemporary worship, although only about 8-12 children ever show up. And of those I'm not sure who would stay (or come early) for class. Each of our morning classes (divided by either age or grade) has on average 23 - 25 children.
Okay, that's a lot of info. Hope it's helpful to someone.