The birds, the bees and the Berenstain bears

What happens when Sister Bear noticies that Mama's lap is shrinking?

No, it's not that Mama is eating too much salmon and honey comb.

Mama is going to have a baby! With a little help from Mama and Dr. Gert, Sister learns about the birds and the bees...and sonograms, too!From the Trade Paperback edition.