Pop singer Britney Spears has been fattening up her baby son Sean Preston by feeding him ice cream. The TOXIC star gives the eight-month-old tot the sweet treat when he's having trouble sleeping. She says, "He loves ice cream - it makes him sleep better." While Spears loves to treat her son with the frozen dessert, she insists she will be a strict mother when Sean is older. She explains, "I definitely want rules in my house. I'm from the south and we're very strict, you have to say, 'Yes ma'am.' "But at the same time the way of raising kids in LA is too strict. Some people won't let their kids go outside and get dirty; he's a boy."