I also had a bantam that hatched a single chick (the second egg wasn't fertile). She was a first-timer but wasn't very good at it. We let the mama and chick back with the rest of the flock when the chick was 4 weeks old. The mother basically ignored the chick once she was back with the others. The chick had the sense to stay close to her and follow her around though. The first night back in the coop the mama flew up over the door to roost and left the chick to sleep alone. Thankfully the weather was mild. Long story short, the chick thrived and survived quite well. He's obviously low on the totem pole, but he is fast and can get out of the way of the hens when they move in his direction.
I have two more babies, just hatched yesterday. However, this mother is VERY protective. This is also her first time, but the difference is night and day.