A nurse is teaching a new parent how to correctly use a car seat.
Which of the following statements by the parent indicates an understanding of the teaching?

Choice A rationale

Meconium stools are a normal physiological finding in a newborn during the first 24-48 hours of life. This thick, tarry, dark-green stool is composed of intestinal epithelial cells, amniotic fluid, bile, and water, reflecting fetal gastrointestinal tract development and function. Its presence indicates typical bowel activity.

Choice B rationale

Depressed fontanels indicate dehydration in a newborn. The fontanels are soft spots on a baby's head where the skull bones have not yet fused. When a baby is dehydrated, the fluid volume in the brain decreases, causing the fontanel to appear sunken below the normal contour of the skull, which necessitates immediate medical attention due to potential complications.

Choice C rationale

Rust-stained urine, also known as "brick dust" urine, in a newborn can indicate dehydration. This discoloration is caused by the excretion of urate crystals, which are a normal metabolic byproduct. However, in concentrated urine, these crystals become more visible, suggesting insufficient fluid intake and requiring further assessment to prevent significant dehydration.

Choice D rationale

Overlapping suture lines, also known as molding, are a common and expected finding in newborns, especially after vaginal delivery. This temporary reshaping of the fetal skull allows it to pass more easily through the birth canal and typically resolves spontaneously within a few days as the brain grows and fills the cranial cavity.

Choice A rationale

Group B Streptococcus (GBS) colonization in a pregnant client does not typically necessitate a cesarean birth. The primary concern with GBS is the risk of vertical transmission to the neonate during vaginal birth, which can lead to severe neonatal infections like sepsis, meningitis, or pneumonia. Cesarean section is generally reserved for obstetric indications and does not eliminate the risk of GBS transmission if membranes rupture.

Choice B rationale

Intravenous antibiotic prophylaxis is the cornerstone of preventing neonatal GBS disease in colonized mothers. The recommended antibiotics, typically penicillin or ampicillin, are administered during labor once ruptured membranes or active labor commence. This intrapartum treatment significantly reduces bacterial colonization in the birth canal, thereby minimizing the neonate's exposure to the bacteria during passage.

Choice C rationale

A vaginal culture for GBS is typically performed between 36 and 37 weeks of gestation as part of routine prenatal screening. If the client has already been screened and identified as GBS positive at 36 weeks, repeating the culture during active labor is not indicated as the colonization status is already known, and the focus shifts to prophylaxis.

Choice D rationale

Metronidazole is an antibiotic primarily effective against anaerobic bacteria and certain parasites. It is not the drug of choice for Group B Streptococcus prophylaxis. Penicillin or ampicillin are the preferred antibiotics for GBS intrapartum prophylaxis due to their effectiveness against GBS and their favorable safety profile for both the mother and the fetus.