What happens when Sister Bear notices that Mama's lap is shrinking? No, it's not that Mama is eating too much salmon and honeycomb. Mama is going to have a baby! With a little help from Mama and Dr. Gert, Sister learns all about the birds and the bees . . . and sonograms, too! Here is a warm way to give very young children a very first introduction to the facts of life, Bear Country-style.