**Core Concept**
The Apgar score is a method of assessing the health of newborn children against infant mortality. It was developed by Dr. Virginia Apgar in 1952 and is used to quickly evaluate the newborn's physical condition and identify any potential issues that may need immediate attention. The score is based on five components: heart rate, respiratory effort, muscle tone, reflex response, and skin color.

**Why the Correct Answer is Right**
The Apgar score is calculated by assigning a score of 0, 1, or 2 to each of the five components. In this case, the newborn has a heart rate of 110, which is slow and irregular, so the score for heart rate is 1. The respiratory effort is described as slow, so the score for respiratory effort is 1. The muscle tone is flaccid, so the score for muscle tone is 0. There is no mention of a reflex response, so the score for reflex response is 0. The skin color is described as blue, so the score for skin color is 0. The total Apgar score is the sum of the scores for each component.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided.
**Option B:** This option is not provided.
**Option C:** This option is not provided.
**Option D:** This option is not provided.

**Clinical Pearl / High-Yield Fact**
To calculate the Apgar score, remember the acronym APGAR: Appearance (skin color), Pulse (heart rate), Grimace (reflex response), Activity (muscle tone), and Respiration (respiratory effort).

**Correct Answer: 3. A newborn with an Apgar score of 3 would have a heart rate of 100 or less, slow and irregular respiratory effort, flaccid muscle tone, no reflex response, and blue or pale skin color.**