重点是这个女孩已经怀孕了,农耕社会人口是第一生产力，女孩子很小就可以嫁人赶紧的多生儿女，人丁兴旺，多子多福
The point is, this girl is pregnant, the farming community is the first productive, the girls can get married at a very young age and have more children.