Since when did Caillou take it's 2:30PM timeslot on Weekends?
These clearly list Mama in the 2:30PM timeslot, and these days are Weekends
Zap2It from October 10, 2009:
[[1]]
NBC's Internal Docs from April 3, 2011: [[2]]
TitanTV from September 12, 2010: [[ https://web.archive.org/web/20100913061657/http://partners.titantv.com/programming/channel.aspx/callsign/SPROUT/channel/295/major/0/minor/0/sid/75805/pid/0/cid/75805/network/0/pt/6/hd/0/lid/07231a06-30be-481c-998d-b3ec6bf5eeaf/date/20100912/]]