A woman tells the nurse she is planning to become pregnant in the next few months.

When providing preconception counseling, which nutritional recommendation should the nurse emphasize as most critical to prevent birth defects?

Increase vitamin C intake to prevent low birth weight.

Take adequate folic acid to prevent neural tube defects like spina bifida.

Increase zinc intake to prevent preterm labor.

Take calcium supplements to prevent gestational hypertension.

Answer and Explanation

The Correct Answer is B

Choice A rationale

Vitamin C, or ascorbic acid, is an essential water-soluble vitamin that supports collagen synthesis and immune function. While adequate intake is important for general maternal health and tissue repair, it is not the most critical nutritional factor for preventing specific congenital structural birth defects. Increasing vitamin C intake does not have a scientifically proven direct link to preventing major malformations during the first few weeks of embryonic development or organogenesis.

Choice B rationale

Folic acid is a B vitamin required for DNA synthesis and cell division. During the first 28 days of pregnancy, often before a woman knows she is pregnant, the neural tube closes. Adequate folic acid levels, typically 400 to 800 mcg daily, are scientifically proven to significantly reduce the risk of neural tube defects like spina bifida and anencephaly. This is the most critical preconception recommendation to ensure proper spinal cord and brain development.

Choice C rationale

Zinc is a trace element that plays a role in cellular metabolism, protein synthesis, and immune function. While some studies suggest that severe zinc deficiency might be associated with poor pregnancy outcomes or preterm labor, it is not the primary nutrient emphasized in preconception counseling for the prevention of major birth defects. Routine supplementation beyond standard prenatal vitamins is generally not the priority over folic acid for preventing early developmental malformations.

Choice D rationale

Calcium is necessary for fetal bone development and maintaining maternal bone density. While adequate calcium intake might help reduce the risk of preeclampsia or gestational hypertension in women with low baseline intake, it is not the most critical factor for preventing structural birth defects. The normal serum calcium range is 8.5 to 10.5 mg/dL. Its role is supportive of physiological maintenance rather than the prevention of early embryonic neural tube closure failures.

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Correct Answer is B

Explanation

Choice A rationale

Placing a newborn flat immediately after a feeding session increases the hydrostatic pressure against the lower esophageal sphincter. In infants, this sphincter is often physiologically immature, leading to the retrograde flow of gastric contents into the esophagus. Keeping the infant flat facilitates this regurgitation and increases the risk of aspiration. Elevating the head allows gravity to assist in keeping milk within the stomach cavity until the pyloric sphincter can process the bolus.

Choice B rationale

Regurgitation in neonates is frequently caused by swallowed air that creates pressure within the stomach. Periodic burping during and after feedings allows for the controlled release of this air, preventing it from forcing milk upward. Maintaining the infant in an upright or slightly elevated position for 20 to 30 minutes post-feeding utilizes gravity to keep gastric contents at the base of the stomach, thereby significantly reducing the frequency and volume of spit-up episodes.

Choice C rationale

Regurgitation of small amounts of milk is a normal physiological occurrence in newborns due to a short esophagus and a relaxed cardiac sphincter. It is rarely an indication of an allergy to human milk, which contains species-specific proteins that are highly digestible. Switching to formula unnecessarily exposes the infant to foreign bovine proteins and lacks the immunological benefits of colostrum and breast milk. True milk protein allergies typically present with systemic symptoms like rash or bloody stools.

Choice D rationale

Feeding a newborn larger volumes less frequently is counterproductive and dangerous. The neonatal stomach capacity is very limited, approximately 5 mL to 7 mL on day one, and overdistension of the stomach wall triggers the vomiting reflex and increases the likelihood of reflux. Smaller, more frequent feedings align with the natural gastric emptying time and metabolic needs of the infant. Overfilling the stomach exacerbates the anatomical predisposition for spitting up and can cause significant abdominal discomfort.

A. The fetus is descending into a lower position in the pelvis. B. The cervix is beginning to soften and dilate. C. The vaginal mucosa is becoming more congested. D. The woman's body is eliminating excess fluid from pregnancy.

Correct Answer is A

Explanation

Choice A rationale

Lightening occurs when the fetal presenting part, usually the head, descends into the true pelvis toward the end of the third trimester. This movement increases the space in the upper abdomen, relieving pressure on the diaphragm and allowing for easier lung expansion and breathing. However, this descent simultaneously increases mechanical pressure on the urinary bladder and pelvic floor, leading to the reported symptoms of increased urinary frequency and pelvic heaviness.

Choice B rationale

Cervical effacement and dilation are processes involving the thinning and opening of the cervix in preparation for labor, often triggered by fetal head pressure and hormonal changes. While these changes occur in late pregnancy, they do not directly explain the sudden improvement in maternal respiratory capacity. The relief in breathing is specifically linked to the physical repositioning of the fetus away from the thoracic cavity, which is the hallmark of the lightening phenomenon.

Choice C rationale

Increased congestion of the vaginal mucosa, known as Chadwick's sign, is a result of increased vascularity and estrogen levels during pregnancy. While this can cause increased leukorrhea or sensitivity, it does not account for the shift in the woman's ability to breathe or the specific sensation of the fetus dropping. The pelvic pressure mentioned is a mechanical result of fetal weight shifting lower, not a result of localized tissue hyperemia or mucosal congestion.

Choice D rationale

The elimination of excess fluid, or diuresis, typically occurs during the postpartum period rather than at 38 weeks gestation. During late pregnancy, the body actually tends to retain fluid, contributing to physiological edema. The increased bathroom trips described by the patient are not due to systemic fluid loss but are the result of the physical weight of the fetal head pressing directly against the bladder wall, which reduces the bladder's functional storage capacity.

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A woman tells the nurse she is planning to become pregnant in the next few months. When providing preconception counseling, which nutritional recommendation should the nurse emphasize as most critical to prevent birth defects?

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Naxlex Comprehensive Predictor Exams

A new mother is concerned because her 1-day-old infant spits up a small amount after feeding. She asks the nurse how to prevent this. Which instruction should the nurse provide?

Correct Answer is B

Explanation

A woman at 38 weeks gestation tells the nurse, "I can finally breathe better, but now I feel pressure in my pelvis and I'm running to the bathroom constantly!" The nurse explains this is called lightening. Which physiologic event is occurring?

Correct Answer is A

Explanation

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A woman tells the nurse she is planning to become pregnant in the next few months.

When providing preconception counseling, which nutritional recommendation should the nurse emphasize as most critical to prevent birth defects?