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I'd wonder how would Naruto react to be a father since he'd didn't have one when he was growing up?
since Naruto has met his father, I think he wouldn't matter it.
okay, as for me, Naruto and Sakura's kids will be:
1. A boy, his hair is mess such like...Haru from RAVE, and its color will be yellow (or blonde), he has blue eyes and whiskers, but he will be calm and more mature than Naruto around his age, because he inherit intelligence from Sakura, then his eyes' shape will be more like Sakura.
2. A girl, her hair will be orange, she's more like Naruto, very loud and spunky. Her eyes, I like the mix of blue and green (left is green and right is blue). her eyes' shape would be more like Naruto.