Betty, who is now four, is named as the honorary 41st runner in the world's most famous horse race.
Betty, pictured with her parents Phil and Karen, was the size of a Biro when she was born
Betty needed critical care when she was born more than four months premature weighing 1lb 7oz in June 2017. Betty, who was the size of a Biro when she was born, needed constant treatment in the neonatal intensive care unit at Liverpool Women's Hospital.
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