LOS ANGELES, Feb 11 (Reuters) – Singer Beyonce says she wants to give her baby daughter a normal childhood with "sprinklers and … slumber parties." In a Vogue magazine interview released on Monday she also teased her next, as yet untitled, album saying the music is "a lot more sensual … empowering" thanks to motherhood. The Grammy-winning singer, 31, who is married to rapper Jay-Z, took a year off her music career to care for her first child, Blue Ivy Carter, who was born in January 2012. …