As far as I'm concerned, Salada is Karin and Sasuke's daughter. She looks nothing like Sakura, and hey if anything, we can say Sasuke impregnated himself to have a female clone. Uchiha could do something like that right since they are the mighty clan?
You know, if Kishi had wanted this, he could have still made the characters look better. Most of the children are hideous, and most of the young characters look so old and haggard, it isn't even funny.