Developmental windows are wider at later ages, so The Play Kits for children aged 1-year-old and up are shipped every 3 months, instead of every 2 months. Starting with The Babbler (months 13–15), the cost of each Play Kit changes from $80 to $120, though if you break it down to the price per month, it remains the same, $40 (and less if you prepay for multiple Kits).