It's the age old debate -- should children remain with parents in the "Adult" worship service or attend a separate "Children's Church" or similar? In fact, many churches today take a sort of middle ground, where the children stay in the sanctuary until a certain point, then attend "Children's Church".
Children's Ministry Magazine got over 2000 responses to a poll about the topic. Slightly less than half favored keeping children in the main worship, while a bit more than half preferred a separate worship experience for children.
Read opposing comments on "Where should Children Worship?" by two children's ministers.