Which factor increases recurrence risk of cleft lip/palate in future pregnancies?

• A. Maternal age over 40 increases risk.
• B. Being born preterm increases risk.
• C. Family history or syndromic association increases risk.
• D. Ethnicity determines risk.

Answer: (C)

Genetic factors strongly influence whether a cleft lip/palate will recur in future pregnancies. When there is a cleft in a close family member or the condition is part of a recognized syndrome, the couple carries a higher inherited susceptibility, so the chance of another affected child is increased beyond the general population risk. This is because syndromic clefts come with specific genetic or chromosomal causes that can be passed down more predictably, and non-syndromic clefts also show familial patterns, though less dramatically.

Context helps here: the baseline occurrence of cleft lip/palate in the general population is relatively low, but having an affected relative signals a greater likelihood that genetic factors are at play for future pregnancies. In contrast, factors like maternal age over 40 or being born preterm are associated with outcomes of the current pregnancy or other health risks, not with reliably increased recurrence in future pregnancies. Ethnicity affects how common clefts are across populations but does not by itself determine recurrence risk for an individual family.

So, the reason this option is correct is that familial history or an associated syndrome represents a genetic risk that can be passed to subsequent pregnancies, elevating the recurrence risk.