A nurse in a clinic is teaching the mother of a 4-month-old infant who has been breastfed. The mother plans to switch her infant to an iron-fortified formula. Which of the following should be included in the teaching?

Choice A Reason:
Iron is not poorly absorbed in infants; in fact, infants absorb iron quite efficiently. Breast milk contains a small amount of iron, but it is highly bioavailable and well-absorbed. When switching to formula, it is important to use iron-fortified options to prevent iron deficiency anemia.

Choice B Reason:
While iron is essential for overall growth and development, including bone growth, it is not the primary reason for emphasizing iron in infant nutrition. The key concern with iron, especially when transitioning from breastfeeding, is the prevention of iron deficiency anemia, which can affect cognitive and motor development.

Choice C Reason:
This is the correct information to include in the teaching. Infants are born with a reserve of iron that begins to deplete around 4 to 6 months of age. It is crucial to introduce iron-fortified formula at this time to ensure the infant continues to receive adequate iron for development and to prevent iron deficiency anemia.

Choice D Reason:
Iron does play a role in the development of the nervous system, which can indirectly affect vision, but it is not specifically known for facilitating the development of vision in infants. The primary concern with iron intake in infants relates to its role in preventing anemia and supporting overall growth and development.

To calculate the estimated date of birth (EDB), also known as the due date, we use Naegele's Rule, which involves adding one year, subtracting three months, and adding seven days to the first day of the last menstrual period (LMP). Using this rule, if the LMP was on July 27, the EDB would be:

- Add one year: July 27, 2024
- Subtract three months: April 27, 2024
- Add seven days: May 4, 2024

Therefore, the EDB in MMDD format is 0504.
Reason:
Naegele's Rule is a standard way of calculating the due date for a pregnancy. The rule estimates the expected date of delivery (EDD) by adding one year, subtracting three months, and adding seven days to the date of a woman's last menstrual period (LMP). This calculation assumes a regular menstrual cycle of 28 days and ovulation occurring on the 14th day of the cycle. The EDB is typically set at 40 weeks from the LMP, which is approximately 280 days. While this method provides an estimate, only about 4% of births occur on the exact due date, and most births occur within a range of two weeks before or after the estimated due date.

It's important to note that the EDB is an estimate and can be influenced by factors such as the length of menstrual cycles, the exact day of ovulation, and the date of conception. Ultrasounds and other prenatal tests can provide additional information to refine the due date estimate as the pregnancy progresses.