The incidence of breech varies according to the gestation and is 40% at 20 weeks, 6-8% at 34 weeks and 3-4% by term . In most cases of breech there is no reason for the fetus to present by the breech. However, it is useful to look for factors that predispose to breech presentation and ultrasound is useful in this respect. Bicornuate uterus, uterine fibroid, low-lying placenta, multiple pregnancies, polyhydramnios and oligohydramnios are known causes. Rarely could breech presentation be due to congenital malformation such as spina bifida or hydrocephaly.
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.