Board Thread:Naruto Discussions/@comment-26320097-20150423120614/@comment-25402783-20150423141547

It just seems far more likely to me that he married Sakura, they conceived a child shortly after the marriage, said child was Sarada and shortly after she was born he left for reasons unknown at this time. We will probably find out next week as it looks like it will focus on Sasuke and his return to the village.

Japan is also a nation steeped in tradition. One of said traditions is that you don't have kids till your married. Only 3% of children are born out of wedlock (this is one of the reasons why their having a population problem). So it would make more sense for him to marry Sakura and have a child by her, rather than him have a illegitimate child.