7 mon old baby died

Yesterday night my big sister, Taylor, but her youngest baby to bed with his blanket. yesterday morning she went to check up on him and he was wrapped in the blanket and he wasn't breathing or moving. He died. Keatynn was only seven months and a week old. I am heart broken. My whole family is. I don't know what to do. I don't even want to leave my room. I just want to lay in bed and cry. I always wanted to be the cool aunt that spoils my nephew. Now I can't.