Jimmy Fallon coaches little ones everywhere on what he thinks their first word should be: Dada.

In the trailer for his upcoming children’s book Your Baby’s First Word Will Be Dada, the Tonight Show host previews the story to an attentive class—and one excited adult.

“Mama” was Fallon’s daughter Winnie’s very first word, though according to Fallon’s biography for the book, he tried really hard to make her say “Dada.” But this book could help other dads, just in time for Father’s Day.

Your Baby’s First Word Will Be Dada is due June 9, check out the book trailer above.