By Siddharth Cavale (Reuters) -Lysol maker Reckitt Benckiser Group reported a higher-than-expected jump in quarterly sales as households stuck with heightened cleaning regimens a year into the COVID-19 pandemic, and the company backed its full-year outlook. Shares, however, fell nearly 2% in morning trade as a weak flu season saw fewer people reach for cold remedies and declining birth rates hit sales of baby formula products. The Slough-based company reported a 4.1% rise in like-for-like sales for the first quarter, higher than the 2.4% growth analysts had expected, according to a company-supplied consensus, led by Lysol and double digit growth for Airwick fresheners and Finish dishwasher pods.