That's what i've been saying for ages, that kid looks like Karin, looks nothing like Sakura, the eyes, the eyebrows, the chin, the bad eyesight are all Karin.
It might even be Karin's doing on purpose.
Who's gonna heal Sasuke on last chapter and how does her "healing" works?
Uzumaki genes are strong. Naruto kids looks too much like him and if there was some dna mixing in the biting/healing process.....oh gosh