周産期死亡率
the condition of a population of having low birth and death rates
conditions that precipitously increase the birthrate
the branch of medicine concerned with childbirth, called obstetrics
a perinatologist cared for her during the puerperium
Do you think the increase in the Lump Sum Birth Allowance is effective in putting a brake on the declining birthrate?
a person born in the generation following the baby boom when the birth rate fell dramatically