A 3-day-old infant who weighs 6 lb (2722 g) is fed formula every 4 hours. Newborns require about 73 mL of fluid per pound (454 g) of body weight each day. In light of this information,approximately how much formula should the infant receive at each feeding?

2 to 3 oz (60 to 90 mL)

1 to 1.5 oz (30 to 45 mL)

4 to 5 oz (120 to 150 mL)

3 to 4 oz (90 to 120 mL)

Answer and Explanation

The Correct Answer is A

A) 2 to 3 oz (60 to 90 mL):
To determine the appropriate amount of formula for this infant, first calculate the total fluid requirements for the day. The infant weighs 6 lb (2722 g), and newborns typically need 73 mL of fluid per pound of body weight per day.
6 lb × 73 mL = 438 mL of fluid required daily.
Since the infant is fed every 4 hours, this equates to approximately 6 feedings in a 24-hour period.
438 mL ÷ 6 feedings = 73 mL per feeding.
Converting this to ounces (since 1 oz = 30 mL), the infant would need about 2.5 oz per feeding. Therefore, 2 to 3 oz (60 to 90 mL) per feeding is appropriate to meet the infant's daily fluid needs.

B) 1 to 1.5 oz (30 to 45 mL):
This amount is insufficient for the infant’s daily fluid needs. At 1 to 1.5 oz per feeding, the total intake for the day would be only 180 to 270 mL, which is well below the required 438 mL. This could lead to dehydration and inadequate nourishment.

C) 4 to 5 oz (120 to 150 mL):
This amount is excessive for a 3-day-old infant. Newborns typically consume much smaller amounts at each feeding due to their smaller stomach capacity. Overfeeding could lead to discomfort and potential digestive issues.

D) 3 to 4 oz (90 to 120 mL):
While this range is closer to the required amount, it is still slightly too much for a 3-day-old infant. At this age, the recommended amount is closer to 2.5 oz per feeding, so 3 to 4 oz may be excessive and could contribute to overfeeding, which might be uncomfortable for the infant.

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Correct Answer is A

Explanation

A) The vaccine is a live virus and may cause birth defects in the fetus:
The Rubella vaccine is a live attenuated virus, which means it contains a weakened form of the virus. Although this vaccine is safe for most adults, it can cause serious birth defects if a woman becomes pregnant within a 4-week period after receiving the vaccine. The live virus could potentially affect the developing fetus, causing congenital rubella syndrome (CRS), which can result in severe birth defects like heart defects, deafness, and cataracts. To prevent any risk to a future pregnancy, women are advised to wait at least 4 weeks after
vaccination before trying to conceive.

B) Tests to determine if the client developed immunity are not accurate for a month:
This is not accurate. While some tests for rubella immunity can be done soon after vaccination, the primary reason for delaying pregnancy is the live virus in the vaccine, not a delay in testing. The immune response to the vaccine typically develops within a few weeks, but the risk to a fetus comes from the live virus, not the testing process. The 4-week delay is to ensure that the virus has been cleared from the body before pregnancy is attempted.

C) She may have the virus and feel too sick to tolerate a pregnancy:
While the Rubella vaccine can cause mild side effects like fever, it does not typically cause significant illness that would prevent a woman from tolerating a pregnancy. The primary concern is the safety of the fetus, not the mother's symptoms, as any illness is generally mild and transient. The 4-week delay is to prevent potential harm to a fetus due to the live virus present in the vaccine.

D) Her body is not ready to nurture another pregnancy so quickly:
This rationale is not based on any medical guideline. There is no evidence to suggest that the body needs time to "recover" from the Rubella vaccine before becoming pregnant. The reason for the 4-week delay is to ensure that the live virus has been cleared from the body to avoid any risk to a potential pregnancy. The concern is not about the woman's ability to support another pregnancy, but about the potential for the live vaccine virus to harm a developing fetus.

A. Prolactin B. Estrogen C. Progesterone D. Human placental lactogen E. Relaxin

Correct Answer is A

Explanation

A) Prolactin:
Prolactin is the primary hormone responsible for stimulating milk production in the postpartum period. In breastfeeding mothers, prolactin levels remain elevated, especially during the first few weeks after delivery, to support lactation. This hormone is released in response to suckling and is essential for maintaining a steady milk supply. Elevated prolactin levels help establish and maintain breastfeeding during the early postpartum period, even as other pregnancy-related hormones begin to decline.

B) Estrogen:
Estrogen levels drop sharply after childbirth, as the placenta is no longer present to produce this hormone. The decline in estrogen is one of the factors that helps initiate lactation. While estrogen rises later during the postpartum period as the body returns to its non-pregnant state, it is not elevated during the immediate postpartum period in breastfeeding women.

C) Progesterone:
Similar to estrogen, progesterone levels fall quickly after delivery. Progesterone is involved in maintaining pregnancy, and its levels decrease significantly once the placenta is delivered. A reduction in progesterone is one of the hormonal changes that triggers the onset of lactation. It does not remain elevated in the immediate postpartum period.

D) Human placental lactogen (hPL):
hPL is produced by the placenta during pregnancy to support fetal growth and prepare the breasts for lactation. However, after delivery, hPL levels decline rapidly because the placenta is expelled. It is not elevated in the immediate postpartum period.

E) Relaxin:
Relaxin is a hormone that helps to soften the cervix and relax the ligaments in preparation for childbirth. Its levels are elevated during pregnancy and drop significantly after delivery. It does not remain elevated in the postpartum period, particularly in breastfeeding women.

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A 3-day-old infant who weighs 6 lb (2722 g) is fed formula every 4 hours. Newborns require about 73 mL of fluid per pound (454 g) of body weight each day. In light of this information,approximately how much formula should the infant receive at each feeding?

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Naxlex Comprehensive Predictor Exams

A postpartum client is to receive the Rubella vaccine prior to discharge from the hospital. Why is she instructed to not become pregnant for 4 weeks after receiving this vaccine?

Correct Answer is A

Explanation

What hormone remains elevated in the immediate postpartum period in a breastfeeding patient?

Correct Answer is A

Explanation

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