Neonatal encephalopathy may be followed by the development of cerebral palsy, while other cases of cerebral palsy may occur following a clinically normal neonatal period. It is accepted that the presence of neonatal encephalopathy indicates that a neurological insult has taken place during labour or the early neonatal period, while its absence is thought to indicate an insult at some earlier time in pregnancy . Gaffney et al.  examined the obstetric background of 141 children from the Oxford Cerebral Palsy Register. Forty-one children whose cerebral palsy was preceded by neonatal encephalopathy were compared with 100 who had not suffered from neonatal encephalopathy. The babies with neonatal encephalopa-thy were more likely to have been delivered at 42 weeks'
gestation or more (odds ratio 3.5; 95% CI 1-12.1). Babies born at 42 weeks or more to nulliparous women were at particular risk of this sequence of events (odds ratio 11.0; 95% CI 1.2-102.5).
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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.