Tā tóutāi shēng le ge nǚ'ér, èrtāi shēng le ge érzi.
Her first child was a daughter and her second a son.
Tips
usage
头 here means 'first', and later births count on from it: 二胎, 三胎. The word covers both the first pregnancy and the child it brings; the first-born is also called 老大.
