**Core Concept**
A congenital cataract involving the visual axis can cause amblyopia (lazy eye) if left untreated, leading to permanent vision loss. Early surgical intervention is crucial to restore vision and prevent amblyopia.

**Why the Correct Answer is Right**
In this scenario, the child requires immediate surgical intervention to remove the cataract and restore vision. The goal is to perform the surgery within the first few weeks of life, ideally within the first month, to prevent amblyopia. This is because the visual cortex is most plastic and adaptable during this period, making it an ideal time for intervention. The surgery involves removing the cataractous lens and replacing it with a clear intraocular lens (IOL) to restore vision.

**Why Each Wrong Option is Incorrect**
**Option A:** Waiting for 3-6 months may lead to permanent vision loss due to amblyopia.
**Option B:** Conservative management with glasses or contact lenses may not be effective in this case, as the cataract is located in the visual axis.
**Option C:** Observation alone may lead to permanent vision loss due to amblyopia.

**Clinical Pearl / High-Yield Fact**
Early surgical intervention for congenital cataracts is crucial to prevent amblyopia and restore vision. The American Academy of Ophthalmology recommends surgery within the first few weeks of life to optimize visual outcomes.

**Correct Answer:** C.