## Core Concept
Infant mortality refers to the death of an infant before their first birthday. It is a critical indicator of the overall health and well-being of a population, as well as the effectiveness of a country's healthcare system. Infant mortality rates are often used to assess the quality of prenatal care, delivery practices, and infant care.

## Why the Correct Answer is Right
The correct answer, ., implies that stillbirths are not included in infant mortality rates. This is because infant mortality specifically refers to the deaths of live-born infants. Stillbirths, on the other hand, refer to fetal deaths that occur after 28 weeks of gestation but before birth. These are tracked separately as part of perinatal mortality.

## Why Each Wrong Option is Incorrect
* **Option A:** This option is incorrect because deaths due to accidents or injuries are indeed included in infant mortality rates if they occur within the first year of life.
* **Option B:** This option is incorrect because congenital anomalies are a significant cause of infant mortality and are included in the statistics.
* **Option C:** This option is incorrect because deaths due to infections, such as pneumonia or sepsis, are also included in infant mortality rates.

## Clinical Pearl / High-Yield Fact
A key point to remember is that infant mortality rates are a composite measure that can be influenced by a wide range of factors, including socioeconomic status, access to healthcare, maternal health, and the quality of care provided to infants. Understanding the causes and trends in infant mortality is crucial for public health planning and intervention.

## Correct Answer: D. stillbirths.