Does a low-lying placenta cause preterm birth?

Written by Zhao Li Li
Obstetrics
Updated on May 05, 2025
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In cases of placenta previa, there is also a certain risk of preterm birth. Generally, in the late stages of pregnancy, a persistent low-lying placenta may have some impact on the development of the placenta and embryo. Excessive physical activity or normal daily activities may cause abnormal vaginal bleeding. Long-term blood clots pressing on the cervix can also promote cervical dilation and lead to preterm birth. Therefore, it is generally necessary to rest in bed and avoid excessive exercise after placenta previa occurs, in order to reduce the risk of bleeding.

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Written by Du Rui Xia
Obstetrics
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How many weeks early can a premature baby survive?

Preterm birth refers to births that occur after 28 weeks of pregnancy but before 37 weeks. Preterm infants have lower resistance compared to full-term infants and generally require special care to survive. The survival rate varies with the gestational age: at 32 to 33 weeks, the survival rate can reach 95%; at 28 to 31 weeks, it is between 90% and 95%; at 26 weeks, it is around 80%; and at 27 weeks, it is about 90%. After 34 weeks of pregnancy, the survival rate of the baby is very high, almost the same as that of a full-term baby.

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Written by Zhao Li Li
Obstetrics
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Premature birth is how many weeks?

Under normal circumstances, embryos that develop from 28 to 40 weeks are considered viable, and babies born during this period generally have a good survival ability. However, babies born before 37 weeks of amenorrhea are generally considered premature. Therefore, babies born between 28 weeks and 36 weeks plus 6 days are considered premature. Premature babies, due to the immaturity of their organs and systems, are prone to complications. If the baby has already been born, it is recommended to actively pursue appropriate premature care and symptomatic treatment.

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Written by Zhang Lu
Obstetrics
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Definition of premature birth date

Premature birth, compared to miscarriage and full-term birth, is defined differently. A miscarriage refers to childbirth before 28 weeks, and a full-term birth is one that occurs after 37 weeks. Births that occur between 28 weeks and 36 weeks plus 6 days are collectively referred to as premature births. During this period, the fetus is relatively larger and has a certain level of maturity, so the survival rate is relatively high. However, it still falls short when compared to full-term infants. Generally, 34 weeks is used as a boundary: infants born from 28 to 34 weeks are referred to as early preterm, while those born between 34 weeks and 36 weeks plus 6 days are considered late preterm. Therefore, premature births are divided into these two main categories. In clinical practice, if there are signs of premature birth, it is recommended to try to extend the gestational age and aim for childbirth during the late preterm period.

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Written by Liu Wen Li
Obstetrics
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How is preterm birth defined?

Premature birth means that the gestational period is not yet complete, and the baby is born before reaching full term, which is called preterm birth. Specifically, this ranges from more than 28 weeks but less than 37 weeks of gestation. Due to the incomplete development of premature infants, their organ functions are relatively poor. Therefore, caring for premature infants can be more challenging, often requiring pediatric care and enhanced nursing. Moreover, there are more complications, so it is important to try to prevent premature births as much as possible.

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Written by Zhang Lu
Obstetrics
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Premature birth is how many weeks?

Premature birth refers to childbirth occurring before full-term pregnancy. In contrast, the terms miscarriage, full-term birth, and post-term birth are used, differentiated mainly by the gestational weeks. Miscarriage refers to the expulsion of a fetus before 28 weeks of pregnancy, premature birth refers to expulsion between 28 and 36 weeks plus 6 days, full-term birth refers to expulsion between 37 and 41 weeks plus 6 days, and post-term birth refers to expulsion after 42 weeks of pregnancy. The definition of premature birth being set between 28 and 36 weeks plus 6 days mainly stems from the fact that during this time period, the fetus already has a significant chance of survival. However, the overall survival rate is lower than that of a full-term birth. It is crucial to promptly treat the newborn in cases of premature birth, while also preventing complications in the mother.