firstborn

adj.

头生的（子女），初生的，第一胎生的；

n.

初生儿，长男，长女；

1. I am the firstborn child of my parents.
   我是我父母的第一个孩子。

The firstborn's adjustment to the birth of a sibling: A longitudinal assessment.
Cognitive Attainment among Firstborn Children of Adolescent Mothers.
Firstborn adolescent daughters and mothers with and without premenstrual syndrome: a comparison.
A firstborn boy is suggestive of a strong prognostic factor in secondary recurrent miscarriage: a confirmatory study.
Traumatic intracranial haemorrhage in firstborn infants and delivery with obstetric forceps.
[Zn (SiO )(C H O ) ] : the firstborn of a metallosilicate–organic hybrid material family (C H O = isophthalate)
[Zn8(SiO4)(C8H4O4) 6]n: The firstborn of a metallosilicate-organic hybrid material family (C8H4O4 = isophthalate)
The transition from expectancy to parenthood: Impact of the firstborn child on men and women
The Transmission of Religious Beliefs and Practices from Parents to Firstborn Early Adolescent Sons
Activities and Interactions of Mothers and Their Firstborn Infants in the First Six Months of Life: Covariation, Stability, Continui...