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| Written by | Tony Geiss and Sam Pottle |
| Publisher | Sesame Street Inc. |
| First | Episode 0973 |
"Little Sister is a Big Girl Now" is a Sesame Street song. Olivia insists that she is grown up, and can take care of herself, while Gordon reminds her of all the times he took care of her when they were children. At the end of the song, Gordon admits that maybe things have changed since they were small, and Olivia tells him there is one thing that has not: she still loves her big brother.