Opening Bell: U.S. Stocks Dip on China Worries; Aetna Profit Rises

January’s market declines are continuing on the first day of February. U.S. stocks opened lower on the first trading session of the month, as fresh concerns about China’s economy surfaced. The manufacturing sector in the world’s second largest economy slowed again in January for the sixth month in a row. ‘But still, the Chinese economy is performing - if you believe the statistics - relatively well versus other [countries],’ said Simon Smith, chief economist at FxPro, based in London. Meanwhile, back in the U.S., consumer spending for the month of December was flat, while personal income rose 0.3 percent. Finally, health insurance giant Aetna (AET) reported a 38 percent rise in profits for its fourth quarter, and estimates topped Wall Street's expectations. The company saw a lift from its Medicare and Medicaid divisions. TheStreet’s Scott Gamm reports from Wall Street.