Book excerpt: Luke is a five-year old boy who lives with his mom and dad. He enjoys his life as an only child, but gets really excited when his parents tell him that his mom is pregnant and he will soon have a little sibling. Luke watches as his mother's belly grows and the family awaits the baby's arrival. However, after the baby arrives, Luke begins to notice that his mother cries, yells and sleeps a lot more than she did before. While Luke is very happy to have his new sibling, he also wonders why his mommy is not happy anymore.