“Do you want me to read to you?” my oldest asked his almost 2-year old sister recently. She nodded eagerly. “How about this one?” He was holding up one of her current favourites, a sturdy Usborne book entitled Where Do Babies Come From? My heart warmed as they snuggled on the couch together. “A tiny seed from the father, called a sperm, joins with a tiny egg from the mother,” he read, while she lifted the flap to see a small human growing in-utero.