Reindeer Who Flew to Earth

My book is about a baby reindeer who's mum, dad and two brothers was flying Father Christmas in a sleigh, in the sky, on Christmas Eve with Christmas gifts for people all round the world. Quite suddenly he fell and floated slowly down to a beautiful field. Fortunately for him a friendly mare and her baby foal looked after him. The next day a local lady saw him and realized that he was not a baby foal. He was a reindeer!He enjoyed living there but did not get too big.But one day he saved a big pony from the lake. He learnt to fly and enjoyed it. But eventually decided to stay at the farm with his new friends!