Which presumptive sign (felt by the woman) or probable sign (observed by the examiner) of pregnancy is not matched with another possible cause?

The correct answer is A. You may find that you need to modify your exercise to walking later in your pregnancy, around the seventh month.

Choice A reason: This is the best advice for the woman, as it acknowledges that jogging is safe and beneficial in early pregnancy, but also informs her that she may need to adjust her exercise intensity and duration as her pregnancy progresses. Walking is a low-impact aerobic activity that can be done throughout pregnancy, as long as there are no complications or contraindications. Walking can help maintain cardiovascular fitness, prevent excessive weight gain, and reduce the risk of gestational diabetes and preeclampsia.

Choice B reason: This is not a good advice for the woman, as it implies that jogging is harmful for her joints and that she should stop it immediately. Jogging is not necessarily bad for the joints, as long as the woman wears appropriate shoes, avoids uneven surfaces, and listens to her body. Jogging can also provide many health benefits for the woman and the fetus, such as improved mood, increased energy, and reduced stress².

Choice C reason: This is a false and alarming statement that may discourage the woman from exercising at all. Exercise during pregnancy is not dangerous for the fetus, unless there are specific medical conditions or complications that prevent it. Exercise during pregnancy can actually improve the fetal growth, development, and oxygenation, as well as reduce the risk of preterm birth and low birth weight.

Choice D reason: This is an unrealistic and misleading statement that may cause the woman to overexert herself or ignore the signs of discomfort or fatigue. Exercise during pregnancy may need to be modified according to the woman's changing needs, abilities, and preferences. Some factors that may affect the type, frequency, intensity, and duration of exercise during pregnancy include the trimester, the fetal position, the maternal weight, the environmental temperature, and the presence of any symptoms or complications.

Choice A reason: Diabetes mellitus is not a direct consequence of inadequate weight gain during pregnancy for the infant. However, maternal diabetes can increase the risk of fetal macrosomia (large birth weight), congenital anomalies, and neonatal hypoglycemia (low blood sugar) in the infant.

Choice B reason: Down syndrome is not a direct consequence of inadequate weight gain during pregnancy for the infant. Down syndrome is a genetic disorder caused by an extra copy of chromosome 21 in the cells of the fetus. The risk of having a baby with Down syndrome increases with maternal age, but it is not related to maternal weight or nutrition².

Choice C reason: Spina bifida is not a direct consequence of inadequate weight gain during pregnancy for the infant. Spina bifida is a neural tube defect that occurs when the spine and spinal cord do not form properly in the fetus. The main risk factor for spina bifida is a lack of folic acid (a B vitamin) in the mother's diet before and during pregnancy.

Choice D reason: Intrauterine growth restriction (IUGR) is a condition in which the fetus does not grow as expected and has a low birth weight. IUGR can have many causes, such as placental problems, infections, chromosomal abnormalities, and maternal factors. One of the maternal factors that can contribute to IUGR is inadequate weight gain during pregnancy, especially in underweight women. IUGR can increase the risk of complications for the infant, such as preterm birth, low Apgar score, hypothermia, hypoglycemia, and breathing problems⁵.