Popsugar Family Siblings What Are Bookend Babies? Cute Photos of "Bookend" Siblings That Prove You Shouldn't Be Too Worried About Big Age Gaps April 6, 2020 by Alessia Santoro View On One Page Photo 2 of 18 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 2 Previous Next Start Slideshow SiblingsPhotographyParenting