Max and Ruby's sibling skills are put to the test with the arrival of twins.Know-it-all Ruby thinks she's an expert on babies, especially now that her mother is pregnant. She tries to explain to her little brother where babies come from, but mischievous Max knows they come from taxis, as that's how their cousins arrived. Not to be outdone, Ruby uses her Hannah the Howler doll(an extremely creepy, wide-eyed white human) to show Max how to care for babies. After pressing a button that makes the doll cry, Ruby demonstrates how to feed, diaper, bathe, and put Hannah to bed. But Max considers their efforts finished only when he wakes Hannah up with a final push of her button. Wells' signature illustrations raise the excitement—and humor—when Mama and Papa bring home not one, but two babies (by taxi, of course!). Piles of laundry and a flurry of adults carrying babies to and fro, day and night realistically depict life with newborn twins. All seems well, albeit busy, until the day nothing makes the babies happy. Not changing their diapers, giving them a bath, or winding up their Vibra-Chairs. Then Max remembers Hannah! Her wailing makes the twins' crying turn to giggles and, finally, sleep. Youngsters expecting one or more additions to their own families will find warmth and wit here to ease the transition.Double trouble finds comic relief. (Picture book. 4-8)

– Kirkus Reviews, July 1, 2019