Your baby's gender was set the moment an x sperm or a y sperm reached the egg, even before implantation. People buying girl stuff will not affect it. When the baby poops through all the clean pajamas and it is the middle of the night, you will look fondly at the pink pajamas and be glad they are clean.
Thats weird. Lol couldnt they at least buy neutral?
Well idk why they're buying girl stuff since you don't know what you're having. But it won't jinx anything.