Three-year-old female baby ate half a pill of emergency contraception, a small amount of emergency contraceptive pills have little effect, and then to avoid the child to take emergency contraceptive pills, taking too much may cause breast development, liver and kidney function damage, precocious puberty. Emergency contraceptive pills are preparations containing estrogen and progesterone, women before the age of 18 are not recommended to consume, eat half a grain of emergency contraceptive pills, the impact on the female body is relatively small, it is recommended to drink more water and more urination to promote the excretion of drugs, to reduce the harm to the body. If underage women often consume emergency contraceptive pills, may stimulate the development of mammary glands, resulting in breast enlargement, may also increase the burden of liver and kidney function, there will be precocious puberty, the onset of menstruation occurs relatively early. Drugs in the home as far as possible in a place where the child can not get, taking emergency contraceptive pills for a relatively short period of time, can be followed up to observe whether there are any abnormal symptoms, there are abnormalities in a timely manner to seek medical attention.