**Question:** Percentage of newborns with cleft palate and cleft lip:

A. 20%
B. 30%
C. 40%
D. 60%

**Core Concept:** Cleft lip and palate are developmental abnormalities that occur when the structures involved in the formation of the lip and palate do not develop properly during fetal growth. These abnormalities can be caused by genetic factors or environmental factors, such as exposure to certain medications or infections during pregnancy. Cleft lip (CL) and cleft palate (CP) are often combined and referred to as cleft lip and palate (CLP).

**Why the Correct Answer is Right:** The correct answer states that approximately **60% of newborns** with cleft lip and palate have a combination of both CL and CP. This is consistent with the known prevalence of CLP, which is around 60%. The combination of CL and CP occurs due to incomplete fusion of the structures involved in their development, such as the maxilla, palatal shelves, and primary palate.

**Why Each Wrong Option is Incorrect:**

A. **20%:** This is a low percentage for CLP, which suggests a different condition. Cleft lip and palate is a common congenital abnormality, so this choice is too low.

B. **30%:** This is still too low for CLP prevalence in newborns. A more reasonable estimate for CLP prevalence is around 30%.

C. **40%:** This is also too high, as CLP prevalence is not typically around 40% in newborns.

D. **60%:** This matches the correct answer (60%) and is consistent with the known prevalence of CLP.

**Clinical Pearl:** Cleft lip and palate are complex developmental defects, which can be associated with developmental syndromes or genetic disorders, such as Stickler syndrome, Waardenburg syndrome, or Treacher Collins syndrome. Early diagnosis and multidisciplinary management involving geneticists, orthodontists, and plastic surgeons can improve the quality of life for individuals with cleft lip and palate. Early intervention can help prevent complications like obstructive sleep apnoea, dental issues, and speech problems.

**Why the Correct Answer is Right:**

Cleft lip and palate (CLP) is a congenital anomaly that affects the development of the upper lip, palate, and pharyngeal structures. This leads to abnormal separation of the lip and palate, and can cause difficulties in feeding, breathing, and speech development in affected individuals. The combination of CL and CP occurs due to incomplete fusion of the maxilla, palatal shelves, and primary palate during embryonic development. The primary palate is the roof of the mouth, which is formed by fusion of the maxilla, palatal shelves, and primary palate. Failure of fusion of these structures leads to CLP.

**Why Each Wrong Option is Incorrect:**

A. **20%:** This option is too low and does not accurately represent the prevalence of CLP in the general population.

B. **3