Kourtney Kardashian has defended her decision to co-sleep with her children. The Poosh founder, 45, insists it feels “natural and instinctual” for her to have her children in the same bed as her and revealed her eldest daughter, Penelope, 12, did so until she was 11. The reality star – who has Penelope and sons Reign, nine, and Mason, 14, with former partner Scott Disick, and 10-month-old son Rocky Thirteen, with husband Travis Barker – told the ‘Skinny Confidential’ podcast: “I think every person’s different and every child is different. My oldest son slept with me till he was seven. “I mean …