congrats on the baby, he is a doll. Cute markings!
Its sad that the mom was not a proper mom & also sad that the backyard *breeder* didnt want to care for the pups until they are old enought to be properly placed in a good home, but at least he has one!!!
Because he is so young I would socialize him tons & tons, that can cause major problems later in life. Get him in a puppy class too when he is older (16 weeks or so) after his series of vaccines!
good luck with the cutie!