Defining disorders of growth requires relating a given achieved growth to an expected growth. In the case of fetal growth, three further levels of complexity arise. First, growth is determined in part by gestational age and an apparentgrowth disorder may reflectan inaccurate assessment of gestational age. Second, even if gestational age is known accurately, the size of the fetus can only be assessed indirectly by ultrasound. Third, even accepting these limitations, fetal measurements are typically related to a population-based norm. Deviation from normal may arise from parental determinants of growth, such as race and stature. The primary interest in assessing fetal growth is to avoid the complications associated with a fetus that is poorly grown due to uteroplacental insufficiency. The most important consequence of fetal compromise is perinatal death, principally antepartum stillbirth.
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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.