Parents recommend starting with age-appropriate books like Little Owl's Egg, The New Baby by Mercer Mayer, and I'm a Big Brother or I'm a Big Sister by Joanna Cole. For parent guidance, Siblings Without Rivalry by Adele Faber and Peaceful Parent Happy Siblings by Laura Markham are frequently recommended. Reading these books nightly helps normalize the idea, and many parents find their toddlers start role-playing caring for the new baby through pretend play.