Dystocia, shoulder dystocia and obstetric trauma are all increased in post-term pregnancy . Here, the risks increase with increasing fetal weight, but gestational age remains a risk factor independent of birthweight. In a case-matched study of 285 women with uncomplicated singleton post-term pregnancy and spontaneous onset of labour and 855 women with uncomplicated singleton term pregnancy, Luckas et al.  showed that Caesarean section was significantly more common in women with post-term pregnancy (relative risk = 1.90, 95% CI = 1.29-2.85). The increase was equally distributed between Caesarean sections performed for failure to progress in labour (RR = 0.74, 95% CI = 1.02-3.04) and fetal distress (RR = 2.00,95% CI = 1.14-3.61). This finding is consistent with the hypothesis that some cases of prolonged pregnancy are associated with a defect in the physiology of labour, in addition to any increase in risk of fetal hypoxia. However, the possibility of bias in management arising out of the knowledge that a pregnancy is post-term cannot be excluded as a factor in the increase in Caesarean section rates.
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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.