**Core Concept**
The definition of a stillborn child is a critical concept in obstetrics, referring to a fetus that has died in the womb and is delivered after a certain gestational age. This definition is crucial for determining the cause of death and providing accurate information to the family.

**Why the Correct Answer is Right**
A stillborn child is typically defined as a fetus that has died in the womb after a gestational age of 20 weeks or more. This definition is based on the World Health Organization's (WHO) guidelines, which aim to standardize the reporting of stillbirths worldwide. The exact gestational age may vary slightly depending on the country or region, but 20 weeks is a commonly accepted threshold. The definition also takes into account the fact that fetal viability increases significantly after 20 weeks, making it more likely that the fetus could have been born alive with proper medical care.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a gestational age, which is a critical factor in determining stillbirth.
**Option B:** This option is incorrect because it is too broad and does not account for the gestational age of the fetus.
**Option C:** This option is incorrect because it is too narrow and only considers stillbirths that occur after 28 weeks of gestation.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the definition of stillbirth can vary slightly depending on the country or region, but 20 weeks is a commonly accepted threshold. This knowledge can be crucial in determining the cause of death and providing accurate information to the family.

**Correct Answer: D. Fetus that has died in the womb after a gestational age of 20 weeks or more.**