In this study, more than 30,000 women who had a miscarriage (their miscarriage occurred before 24 weeks of gestation) were divided into three groups: those who had a pregnancy within 6 months of miscarriage, those who had a pregnancy between 6 and 24 months after miscarriage, and those who had a pregnancy more than 24 months after miscarriage. It was found that the group of women who had a pregnancy within 6 months of miscarriage had the best birth outcomes (both mother and baby); those who had a second pregnancy more than 24 months after miscarriage had the worst birth outcomes. These outcomes include: recurrent miscarriage, intrauterine death, ectopic pregnancy, cesarean section, preterm birth, and low birth weight. Therefore, the argument for 6 months of post-abortion contraception does not hold water. A prospective study published in 2015 in the Journal of the American Congress of Obstetrics and Gynecology (Greyhound Journal) divided women who miscarried before 20 weeks of gestation into two groups: those who became pregnant within 3 months after miscarriage and those who became pregnant 3-6 months after miscarriage. The results found no significant differences in live birth rates and adverse pregnancy outcomes (including miscarriage rates) between the two groups. The average time from the end of miscarriage to pregnancy in the former group was less than 9 weeks! In other words, not to mention 6 months, you can get pregnant two or three months after miscarriage without affecting the health of your child at all! At the Reproductive Center of the Department of Obstetrics and Gynecology of Peking Union Medical College Hospital, Professor Deng Chengyan told me that for women with so-called “biochemical pregnancy” (urine or blood tests suggesting pregnancy, but the ultrasound never sees a gestational sac), they recommend actively trying to have a baby that month. My wife also experienced an embryonic abortion where the baby lost its heartbeat at 9 weeks of gestation, which was a very sad event and directly changed our work schedule. When we got our period back, we didn’t delay and were still active in having a baby. As a result, our baby was born without any problems and looks very cute so far. In conclusion, 6 months of rest is not necessary after an early pregnancy miscarriage, and maybe not even 3 months. Many doctors and patients ask, why is this? I don’t know, and neither do researchers. Many explanations have been proposed, such as the immune theory, such as the trophoblast theory, and so on, all of which have yet to be proven. In other words, we don’t know the “cause”, but we already know the “effect”. The mysterious “cause” should be left to clinicians and basic pathophysiologists. On the other hand, we already know that in cases of induced labor or full-term delivery at 20 weeks of gestation or more (above, not below), there is a significant increase in fetal and neonatal morbidity if the next pregnancy is less than 18 months apart. It has also been found that the neonatal morbidity rate is lowest in pregnancies with an interval of 12-24 months between pregnancies (pregnancies with more than 20 weeks of gestation). Too short an interval (less than 6 months) or too long an interval (more than 60 months) have adverse conditions, with intervals of less than 6 months being the worst and many problems occurring in the mother’s body. Why does this happen? It is thought to be related to folic acid metabolism, but the exact mechanism remains unclear to us.