Congrats on ur new baby, i know how precious they are and fragile at the same time, u got great tips in the above posts

and as said, i would worry more about ur friends kids then ur own while they are around the puppy, i dont allow other kids to handle my little one, in fact im very carefull with allowing other ppl handling her.... its better to be safe then sorry, from day 1 i have told my son of 13 to hold her with both hands and explained why he should, how to handle her when she is on the couche or bed with him etc etc...
my baby was on royal canin when we got her from the breeder and i kept her on that... she grows very well, shes a chubby little thing that loves her food, if she keeps growing this way she will be a giant yorkie lol...
before we brought her home, i bought her a big floppy stuffed animal and brought it to the breeder to keep in the nest of pups so that would get to smell like her brother and sisters, the day we brought her home i put the stuffed animal in her bed and we never heard her cry once

she was great and still is ... im glad i got the oppertunity to do that coz i can only imagine how scary it must be for a litlle one to come home in a strange place etc etc... but with the familiar smell with her she did very well .....
enjoy ur baby