Lolly's Baby Sister

Lolly's Baby Sister is the ninth episode of the fourth season.

Plot
Lolly and Barry have a surprise at school, but they're not telling. Luca and her friends guess what the surprise is. Lolly and Barry know that their mom is going to have a new baby. After school, Luca goes to Lolly's house to write a song about Lolly's new baby. The next day, they have a party at school for baby Shanna.