Any breeder who sells an unweaned baby doesn't care about their birds, only about making money and moving the babies out as quickly as possible...And I'm a 20-year breeder saying this...It's upsetting, because you are not a breeder, you have gotten lucky with your prior birds, and you could still very well aspirate this baby, burn their crop, cause a yeast infection, cause crop stasis/slow crop, or a host of other issues. And that isn't your fault, as you're not supposed to know what you're doing...It's just very upsetting to scrupulous breeders and bird owners...
The whole "don't touch your bird for the first week" thing is not good advice; yes new birds have to settle-in to their new homes, but they also need affection and love and handling, especially if they're hand-raised. And a baby that young cannot go from being hand-fed by it's breeder every day, all day long, to being moved to a new home with a new person and being suddenly ignored. So no, please do not make an effort to ignore him, as it's just bad advice and a "myth" that has been spread over the internet, just like "touching eggs will make the parents abandon them", same thing, a myth...