Mine Ener was worried. She was having trouble feeding her 6-month-old daughter, and she knew that the baby -- who had Down syndrome -- might have to go back on a feeding tube.For several days, the new mother was concerned that she might even harm her baby, Raya Donagi.On Monday morning, she told police that she wanted to ease her daughter's suffering. So Ener laid the girl on a bathroom floor, pressed a kitchen knife against her throat and cut her twice, according to a second-degree murder charge filed Tuesday in Ramsey County. She told paramedics who arrived Monday: "I...