He began to respond to his parents later that night, but was in intensive care for two days. He was later moved to the children's ward. His father, Mark, remained by his bedside while he was in hospital.
"It is a miracle he is doing so well. When you see him, you can't see he was crushed by a train," Mrs Caldwell said.
This week, he began wearing an eye patch to help correct his vision, and the skin that was taken off one side of his face was healing well and not expected to scar.
"He is a strong wee fella, he is back to his old self," Mrs Caldwell said. "He will make a 100 per cent recovery."
His return to St Clair School had been delayed until next year. "It is such a community school ... One time I came home and there were 17 meals for us," Mrs Caldwell said.
She praised the organisers of the Light Party - which was billed as an alternative to Halloween - who gave meals to the family and Lego to Micah.
"It was not anyone's fault ... it was a freak accident."
Light Party organiser John Watson said the trust had kept in contact with the family. "It was a freak accident. It was just crazy ... You have 5500 kids and one little guy gets beaten around a bit with a carriage.'
After supportive feedback, it was planned to stage the event again next year.