Mid-pregnancy refers to the period from the 4th to the 7th month of pregnancy, which is equivalent to about the 13th to the 27th week of pregnancy, and this period is called the middle of pregnancy. At this time, the early pregnancy reaction will gradually disappear and basically no early pregnancy reaction will occur again. Many pregnant women will eat a lot more at this time, so their bellies will get bigger and bigger. It is better to sleep in the left side position at this time to promote blood circulation. It is also possible to avoid the fetus lack of oxygen, the middle of pregnancy can be appropriate to have sex, basically will not have a great impact on the fetus, but must pay attention to control the number and strength of sex, and pay more attention to rest.