Physical character
Age, weight, and height in women during pregnancy affects the risk. Girls aged 15 and younger are at high risk of preeclampsia (a type of blood pressure that occurs during pregnancy). Young women are also at higher risk of underweight (too small for age pregnancy) or infant malnutrition. Women aged 35 and older at high risk for problems such as high blood pressure, diabetes during pregnancy (diabetes that occurs during pregnancy), and complications during childbirth.

Women who weigh less than 100 pounds before becoming pregnant are more likely to have small babies, less weight. Obese women were more likely to have a very large baby, which may be difficult to be born. Also, obese women are more likely to have gestational diabetes and preeclampsia.

Women who are shorter than 5 feet is more likely to have a small pelvis, which could make the movement of the fetus through the pelvis and vagina (birth canal) difficulties during labor. For example, more likely settle the fetal shoulder against the pubic bone. This complication called shoulder dystocia. Also, women are more likely to be short and delivered a preterm baby is not quite developed as expected.

Structural abnormalities of the reproductive organs increases the risk of miscarriage. For example a double uterus or cervix is weak (incompetent) which tends to open (dilated) as fetal growth.

Social character
Being married or in a low socioeconomic group increased problems during pregnancy. The reason for these properties increased risk are unclear but may be linked to another trait that is more common in these women. For example, women are more likely to smoke and to consume less health foods to obtain appropriate medical care.

Previous Problems In Pregnancy
When women experience problems during her first pregnancy, they are more likely to experience problems, often the same thing, in subsequent pregnancies. Some problems include having premature babies, babies who weigh less, babies who weighed more than 10 pounds, infants with birth defects, miscarriages before giving birth late (postterm) (after 42 weeks of pregnancy), Rh incompatibility that require blood transfusions to the fetus , or giving birth requiring a cesarean delivery. If a woman has a baby who died soon after birth, they are also more likely to experience problems in subsequent pregnancies.

Women may have a condition that tends to make the same recurring problem. For example, women with diabetes are more likely to have a baby weighing more than 10 pounds at birth.

Women who have children with genetic disorders or birth defects are more likely to have other babies with similar problems. Genetic tests in infants, even if new born, and both parents are probably right before another pregnancy is attempted. If this woman becomes pregnant again. Some tests such as ultrasound, chorionic villus sampling and amniocentesis can help determine whether the fetus has a genetic disorder or birth defect.

Has experienced six or more pregnancies increase the risk of a very fast labor and excessive bleeding after childbirth. It also increases the risk of misplaced placenta (placenta previa).