A caption for a newborn baby boy or girl should typically include elements that convey love, joy, and the unique characteristics of the child. It can mention the baby’s gender, emphasize their arrival as a precious gift, express gratitude for their presence, and highlight the dreams and hopes the parents have for their child’s future. Including heartfelt words, such as adjectives describing the baby’s adorable features or the overwhelming love they bring, can make the caption more personal and touching.