Toddler Time Series. Toddlers are at a crucial developmental stage, that’s why we created our Toddler Time Series. This series is perfect for children 6 months to 23 months of age. Toddler Time can be made with our 3.5” post or entirely with our HDPE panels. Ages 6 to 23 Months, Capacity 10-14 Children, Use Zone 20' X 20'