形容词头生的（子女），初生的，第一胎生的
名词初生儿，长男，长女
1. He delivered the latest controversy hours before the birth by revealing that he was planning to eat his firstborn's placenta and umbilical cord.
2. To call someone " firstborn " is a way to signify the importance of a person.
3. And some rural areas have allowed parents whose firstborn is a girl, to have another child.
4. She says she plans to have another child after her firstborn arrives in October.