As its customer base slips and healthcare reform looms, Aetna is laying off 625 employees now and will make a similar number of reductions early next year, the company announced. The layoffs are across many areas of the company, and Aetna is not exiting any markets or businesses, the company said. Aetna grew rapidly between March 2007 and September 2008, adding 5,700 jobs nationwide. The company had about 1,000 layoffs at the end of 2008 and no 2009 layoffs until now, the Hartford Courant reports.