The series presented by Ingemarsson and Kallen  shows that the increasing risks of adverse outcome associated with advancing gestation age are more marked in nulliparae than in multiparae (Table 22.2). In an analysis of 181,524 singleton pregnancies with reliable dates delivered at 40 weeks or later in Sweden between 1 January 1987 and 31 December 1992, birthweight of 2 standard deviations or more below the mean for gestational age was associated with a significantly increased odds ratios for both fetal (odds ratios ranging from 7.1 to 10.0) and neonatal death (odds ratios from 3.4 to 9.4) . The Norwegian cohort reported by Campbell et al.  also showed that small-for-gestational age babies were more vulnerable to the risks of prolonged pregnancy. In their series, babies weighing less than the 10th centile had a 5.68 (95% CI 4.37-7.38) relative risk of perinatal death at 42 weeks' gestation or later compared with babies between the 10th and 90th centile at the same gestational age. In this series, birthweight above the 90th centile was associated with the lowest relative risk of perinatal death (0.51; 95% CI 0.26-1.0).
Was this article helpful?
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.