Perinatal mortality in twins is nearly four times higher and in triplets six times higher than in singletons. Cerebral palsy is nearly three times more common in twins, and more than 10 times as common in triplets as in singletons. These figures are per baby, whereas the more relevant figure in counselling parents is the chance of their multiple pregnancy producing any one baby with these complications. Thus a twin pregnancy has eight times and a triplet pregnancy nearly 50 times the chance of a singleton of producing a baby with cerebral palsy [5-7]. This high perinatal wastage is largely attributable to the increased chance overall of prematurity and intrauterine growth restriction and of complications specific to monochorionic twins.
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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.