Having a baby is life-changing. Having a baby sibling is also life-changing. In the children’s book “Leo and the New Baby Challenge,” big brother Leo experiences a lot of big feelings when his little brother comes home. It’s a story a lot of families can relate to. Mariel Brechner, from St. Louis, and her sister, Jacqueline Brechner Vaisman, co-wrote the book. Mariel ed Paige Hulsey to talk about the experience that inspired the story.