**Core Concept**
Postmaturity refers to a pregnancy that extends beyond 42 weeks of gestation. Meconium is the first stool of a newborn, and its color can provide valuable information about fetal health and gestational age.

**Why the Correct Answer is Right**
In cases of postmaturity, the meconium may appear greenish or yellowish, but more often, it can take on a characteristic saffron or greenish-brown color due to the prolonged exposure of the meconium to bile salts. This is because the fetal intestines continue to produce bile, which mixes with the meconium, causing the color change. As a result, saffron-colored meconium is a hallmark of postmaturity, indicating that the fetus has been exposed to meconium for an extended period.

**Why Each Wrong Option is Incorrect**
**Option B:** Tuberculosis (TB) is a bacterial infection that affects various parts of the body, including the lungs and reproductive organs. However, it does not cause a change in meconium color. TB in pregnancy is a serious condition, but it does not lead to saffron-colored meconium.

**Option C:** Breech presentation refers to a situation where the fetus is positioned to be born feet or buttocks first, rather than the typical head-first position. While breech presentation can lead to complications during delivery, it does not affect the color of meconium.

**Option D:** Normal in appearance is incorrect because saffron-colored meconium is not a typical or expected finding in a normal newborn. While meconium can vary in color, a saffron color is generally associated with postmaturity or other pathological conditions.

**Clinical Pearl / High-Yield Fact**
It's essential to note that meconium staining can be a sign of fetal distress or asphyxia, particularly if it's accompanied by other abnormal fetal heart rate patterns or other warning signs. Therefore, healthcare providers should carefully evaluate the color and consistency of meconium to determine the best course of action for the newborn.

**✓ Correct Answer: A. Postmaturity**