There is no rule on how long is the best interval between pregnancies. It depends on a number of factors such as the woman’s age, physical condition, and the way the previous baby was delivered, and there are individual differences, but it is usually recommended that the interval should be between 18 months and 5 years. The interval between pregnancies refers to the time between the delivery of the previous baby and the next pregnancy. How much time is more appropriate is related to the mode of delivery of the previous baby, as well as the woman’s age and physical condition. 1. For pregnant women of the right age who have had a normal delivery (women younger than 35 years old), it is generally recommended that the interval between pregnancies should be more than one and a half years (18 months), so that the woman’s body can not only recover, but also to avoid the lack of breastmilk due to another pregnancy, which would affect the development of the previous baby, but the interval should not be too long, and it is best to be no more than five years. 2. For older pregnant women (over 35 years old), as with age, women’s ability to conceive will gradually decline, the probability of pregnancy prone to high blood pressure, diabetes and other complications are also gradually rising, weighing the pros and cons, the best pregnancy interval is more than 1 year. 3. For pregnant women who had a cesarean section last time, the interval between pregnancies is generally within 2.5 to 4 years. This is because the uterine scar produced by cesarean section reaches its optimal elongation and strength between 2 and 5 years after cesarean section, and the risk of rupture of the scar site after the start of labor increases after less than 2 years or more than 5 years.