Well Storm is doing sit on command now at 9 weeks, down with some coaxing, but stay is not in the vocabulary yet, LOL .
although with 2 additional full size trainers to help she caught on real fast, especially when the treats came out and she realised she wasn't getting any till her butt was on the floor. this weeks lesson is give me MY SPACE, so that she is not jumping up on your leg initially at feeding or treat time, or getting accidently stepped on or kicked from getting under foot when excited.
Any training you can accomplish at this age is one less thing to try & teach later
and as young pups they catch on fast, and you don't have as many bad habits to try and correct later.
I like to do down as soon as possible because if you can get them to go down reliably you can prevent a lot possible accident or hazardous situations just by getting them to stop & drop like right NOW. and Come, Here, IS right behind that.