article_snippet: Jockey Joseph O'Brien (right) has struggled with weight issues over the past couple of years .
article_snippet: Acknowledging Jockey Joseph O'Brien (right) son’s weight issues, O’Brien added:
article_snippet: ‘Obviously (doing) nine stone has been a problem for the last two seasons and last year nine stone was a big problem.
highlights_snippet: Aidan O'Brien is 6ft and struggles to make weights .
  