Rosanna Pownall, 27, and son Adam, two, were engulfed in the 50-strong melee at Haydock Park.
The huge fight broke out during the last race of the day, part of Grand National trials at the Merseyside course on Saturday.
Rosanna, a betting shop worker, was on a family day out with her son and dad.
She said: “Adam was having a run around. Then I saw a commotion and picked him up and then we were suddenly surrounded.
“They knocked into my dad and pram and I nearly went over. People surrounded us trying to grab Adam from me and pulling us in all directions. I screamed for help.”
As the yobs traded punches, racegoers and security tried to pull Rosanna and Adam to safety.
She said: “We were led to a room and left.
“No Jockey Club representatives came to see us. It wasn’t our first time there but we won’t be going back.”
Rosanna, a mum of one, from Eccles, Gtr Manchester, said that in five years of going to Haydock she’d never seen any trouble.
Merseyside Police were yesterday quizzing a man, 26, arrested on suspicion of affray and possessing drugs.
Fighting has marred racing at Goodwood, Ascot and Hexham over the past year.
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