Parents of a 2-year-old are expecting a new baby in 3 months.
They ask the nurse, How can we prepare our toddler for the new baby? To provide appropriate anticipatory guidance, the nurse should explain that toddlers typically respond to a new sibling with:

Choice A rationale

In the context of labor and delivery, power refers specifically to the forces acting to expel the fetus from the uterus. This includes primary powers, which are involuntary uterine contractions that result in effacement and dilation of the cervix, and secondary powers, which involve the voluntary bearing-down efforts made by the mother. While power is essential for the progression of labor, it does not describe the anatomical positioning or orientation of the fetus itself.

Choice B rationale

The passenger refers to the fetus and the placenta. Fetal position, such as left occiput anterior, describes the relationship of a specific fetal landmark to the four quadrants of the mother's pelvis. This is a crucial component of the passenger variable because the way the fetus moves through the birth canal depends on its size, presentation, lie, and attitude. Assessing the passenger allows the healthcare team to predict the ease or difficulty of the descent during labor.

Choice C rationale

Passage refers to the maternal birth canal, which consists of the bony pelvis and the soft tissues of the cervix, pelvic floor, and vagina. While the dimensions and shape of the passage are vital for a successful delivery, this term does not describe the fetus. The nurse must distinguish between the container and the content. Understanding the passage involves clinical pelvimetry, but the fetal position remains a characteristic of the passenger navigating through that specific passage.

Choice D rationale

Psyche refers to the psychological and emotional state of the laboring woman. Factors such as anxiety, previous experiences, cultural expectations, and social support can influence how a woman perceives and manages the pain and stress of labor. Although the mother's psyche can impact the overall progress of labor by affecting hormonal balance and muscle tension, it is entirely distinct from the physical assessment of fetal position or the mechanical factors involving the fetus.

Choice A rationale

While protein is essential for overall health, it is not the primary nutrient responsible for preventing anemia. Anemia in pregnancy is most commonly caused by a deficiency in iron, which is necessary for hemoglobin synthesis, or folic acid and vitamin B12, which are required for red blood cell maturation. Although some protein sources also contain iron, stating that protein alone prevents anemia is scientifically incomplete and misidentifies the specific biochemical role of iron.

Choice B rationale

Gestational diabetes is primarily a disorder of carbohydrate metabolism and insulin resistance, often influenced by placental hormones like human placental lactogen. While a balanced diet including protein is important for glycemic control, eating protein does not inherently prevent the development of diabetes. Management of diabetes risk involves monitoring total caloric intake, complex carbohydrate consumption, and physical activity rather than relying solely on protein intake to prevent the metabolic condition from occurring.

Choice C rationale

Protein is the fundamental building block for all biological tissues, consisting of amino acids required for the synthesis of new cellular structures. During pregnancy, protein requirements increase significantly to support the rapid hypertrophy and hyperplasia of fetal tissues, placental development, and the expansion of maternal blood volume and uterine tissues. Adequate nitrogen balance is crucial for the structural integrity of the developing fetus, making this statement the most accurate reflection of protein's biological role.

Choice D rationale

While protein provides the structural matrix for many tissues, the primary nutrients required for the formation of strong teeth and bones are calcium, phosphorus, and vitamin D. These minerals are deposited into the collagen matrix to ensure proper mineralization and hardness of dental structures. Protein deficiency could theoretically affect the organic matrix, but the specific strength and health of teeth are more directly linked to mineral metabolism and adequate intake of fat-soluble vitamins.