baby gifts

Should people expecting their second or third child have baby showers? Specifically, if the second child is of the same gender, should that family have a baby shower and expect gifts? Is there basic baby shower etiquette for families with multiple children?
I am a 10-month-old baby and I write because my mother has been sending out my "Christmas List" to people, and her list does not in any way represent the things I really want. I could give two s#*ts about receiving stacking cups.