When a baby is born, people like to share the good news with their friends and family. They do this by sending something called a birth announcement. It's like a special card that has important information about the baby, like their name, weight, and the date and time they were born. Some birth announcements even have a picture of the baby on them! This way, everyone knows about the new addition to the family and can feel happy for the parents. It's like saying, "Hey everyone, we had a new baby, and we're so excited!"