**Core Concept**
A suppositous child refers to a child born with a false or fictitious identity, often as a result of a parent or guardian attempting to conceal the true circumstances of the child's birth. This can be due to various reasons, including illegitimacy, adoption, or to conceal a child born out of wedlock.

**Why the Correct Answer is Right**
A suppositous child is often born to a single mother or an unmarried couple, and the father's identity is concealed to avoid social stigma or legal consequences. In the past, this was a common practice, especially among the upper classes. The child's birth certificate might be falsified or altered to conceal the true identity of the parents.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant as it does not provide a definition or description of a suppositous child.
**Option B:** This option might be a distractor, but it does not accurately describe a suppositous child. It could refer to a child born with a false identity, but it is not the most accurate term.
**Option C:** This option is incorrect as it refers to a child born out of wedlock, but a suppositous child can be born to married parents who conceal the true identity of the child.

**Clinical Pearl / High-Yield Fact**
A suppositous child can lead to complex family dynamics and social issues, and it is essential to recognize the signs and symptoms of such a situation to provide appropriate support and care to the child and the family.

**Correct Answer:** D.