The normal ratio is about 105 to 100.Some female births (as well as some male births, though fewer) are not recorded, in order to avoid reprisals by zealous family-planning officials.

• 有些出生的女孩（也有男孩，只是少一些）并没有被记录在册，为的是避免被积极的计划生育官员们打击报复。