A 1 yr 5 month old boy was brought to the Pediatrics OPD by his mother. She complained that her son did not have any teeth till then. All of the following could be the underlying causes EXCEPT?
**Core Concept**
Failure to thrive and delayed teething in a 1-year-old child can be indicative of several systemic and genetic disorders. The condition highlighted in this scenario is known as **Hypodontia**, which is a rare dental anomaly characterized by the absence or underdevelopment of teeth.
**Why the Correct Answer is Right**
Delayed teething in a child can be due to various reasons including genetic factors, systemic diseases, or environmental influences. In the provided options, we will identify the correct underlying cause of delayed teething in a child. Option C is correct because **Congenital Syphilis** is indeed a possible cause of delayed teething in a child. It is a well-known congenital infection that can affect multiple systems, including the dental system, leading to delayed teething.
**Why Each Wrong Option is Incorrect**
**Option A:** **Hypothyroidism** can cause delayed teething in a child due to impaired thyroid hormone production, which affects the development and growth of teeth.
**Option B:** **Cleft Lip and Palate** can also cause delayed teething in a child due to the anatomical abnormalities that can affect the development and growth of teeth.
**Option D:** **Down Syndrome** can cause delayed teething in a child due to the genetic abnormalities associated with the condition, which can affect multiple systems, including the dental system.
**Clinical Pearl / High-Yield Fact**
When assessing a child with delayed teething, it's essential to consider the possibility of systemic diseases, genetic disorders, or congenital infections that can affect dental development.
**Correct Answer:** D. Down Syndrome.