Abercrombie   Fitch Posts Fall in Profit  NEW YORK (Reuters) - Youth-oriented retailer Abercrombie    Fitch Co. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=ANF.N target=/stocks/quickinfo/fullquote"&gt;ANF.N&lt;/A&gt; on Tuesday posted an unexpected fall in  quarterly profit as it struggles to boost sales, and said it  remained cautious for the rest of the year.