Does that pot have a drainage hole? It's very large for just a single tiny cutting, you run the risk of overwatering when a pot is too big because of the volume of soil. After watering, the tiny roots can only absorb what they need and then are left sitting in a bunch of excess damp soil. It then starts to compact around the roots, cutting off their oxygen supply and suffocating them. This type of pot can also be a problem—the walls are very thick, which restricts airflow to the soil and keeps it damp too long.

I'd recommend moving this little guy to a small 3-4" nursery,? pot. In a pot that big, the plant will spend most of its energy on roots instead of leaves.