Bridgit Mendler cradles her new on-screen baby sister in her arms in this new still from Good Luck Charlie.

In the upcoming episode “Charlie is 1,” On Charlie’s (Mia Telerico) first birthday, the Duncan family reminisces about the day she was born, including flashbacks to Bob (Eric Allan Kramer) and PJ’s (Jason Dolley) near-miss with a bear in the woods, Gabe (Bradley Steven Perry) being accidentally left home alone, and Teddy (Mendler) – dressed as Frankenstein – having to track down the family doctor.

“Charlie is 1″ premieres Sunday, May 23 @ 8:30PM ET/PT on Disney Channel.