Intrauterine growth restriction (IUGR) is associated with numerous pregnancy-related risk factors except:

Choice A reason: According to the CDC, nearly half (46%) of all new STDs occur among people between the ages of 15-24¹. This age group also has the highest rates of chlamydia, gonorrhea, and syphilis infections compared to other age groups. Some factors that contribute to this high burden of STDs among young people are biological, behavioral, and social.

Choice B reason: This is incorrect. The age group of 51-60 years old has lower rates of STD infection than the age group of 15-24 years old. According to the CDC, the reported rates of chlamydia, gonorrhea, and syphilis among 51-60 year olds in 2020 were 59.8, 54.7, and 12.4 per 100,000 population, respectively. These rates are much lower than the rates among 15-24 year olds, which were 1,583.3, 1,021.9, and 45.5 per 100,000 population, respectively.

Choice C reason: This is incorrect. The age group of 25-35 years old has lower rates of STD infection than the age group of 15-24 years old. According to the CDC, the reported rates of chlamydia, gonorrhea, and syphilis among 25-35 year olds in 2020 were 1,017.9, 1,015.6, and 66.9 per 100,000 population, respectively. These rates are lower than the rates among 15-24 year olds, which were 1,583.3, 1,021.9, and 45.5 per 100,000 population, respectively.

Choice D reason: This is incorrect. The age group of 36-50 years old has lower rates of STD infection than the age group of 15-24 years old. According to the CDC, the reported rates of chlamydia, gonorrhea, and syphilis among 36-50 year olds in 2020 were 316.6, 337.9, and 27.9 per 100,000 population, respectively. These rates are lower than the rates among 15-24 year olds, which were 1,583.3, 1,021.9, and 45.5 per 100,000 population, respectively.

Choice A: Decreased production of erythrocytes

This is not the primary cause of iron deficiency anemia during pregnancy. While erythrocyte production may be affected in certain conditions, it is not directly linked to iron deficiency anemia in pregnancy¹.

Choice B: Inadequate intake of iron

This is the correct answer. During pregnancy, the body needs more iron to make hemoglobin for the increased volume of blood. If the intake of iron is not sufficient, it could lead to iron deficiency anemia¹.

Choice C: Dilution of hemoglobin concentration

While it's true that the blood volume increases during pregnancy, leading to a relative dilution of hemoglobin, this is not the primary cause of iron deficiency anemia. The main issue is the lack of sufficient iron intake¹.

Choice D: The fetus establishing iron stores

While the fetus does require iron, which it gets from the mother, this is not the primary cause of iron deficiency anemia during pregnancy. The main issue is still the mother's inadequate intake of iron¹.