**Core Concept**
The ideal time of repair for cleft lip is a critical decision that balances the need for optimal aesthetic and functional outcomes with the risks associated with early surgical intervention. This concept is rooted in the principles of pediatric plastic surgery, where the timing of cleft lip repair is influenced by factors such as the age of the patient, the severity of the cleft, and the surgeon's expertise.

**Why the Correct Answer is Right**
The American Cleft Palate-Craniofacial Association (ACPA) recommends that cleft lip repair be performed between 3 to 6 months of age. This timing is based on the understanding that the infant's skin is loose and pliable during this period, making it easier to close the cleft without compromising the surrounding tissue. Additionally, early repair can help to improve feeding and reduce the risk of infection. The repair involves the release of the orbicularis oris muscle and the advancement of the lip segments to achieve optimal alignment and function.

**Why Each Wrong Option is Incorrect**
**Option A:** Performing cleft lip repair at birth is not ideal due to the risk of bleeding and the potential for tissue trauma. This timing may also compromise the integrity of the surrounding tissue, leading to suboptimal aesthetic and functional outcomes.
**Option B:** Repairing the cleft lip at 1 year of age may be too late, as the child's skin may be less pliable and more prone to scarring. Additionally, the longer delay may increase the risk of complications and affect the overall success of the procedure.
**Option C:** Repairing the cleft lip at 2 years of age is also not recommended, as it may be associated with increased scarring and a higher risk of complications. The child's skin may also be more prone to stretching and distortion, leading to suboptimal aesthetic outcomes.

**Clinical Pearl / High-Yield Fact**
The timing of cleft lip repair is critical, and surgeons should strive to perform the procedure between 3 to 6 months of age to achieve optimal aesthetic and functional outcomes.

**Correct Answer: C. 3 to 6 months of age.**