Board Thread:Theories and Speculation/@comment-3365837-20160826052003/@comment-734582-20160827182252

Heliosraven wrote: You should read the full post I did. I already adressed that: the other jinchuriki were extremely unlike to ever get pregnant, as they were considered nothing but tools. The femals we know of have no known partners.

And again: pregnancy is very telegraphed, the jinchuriki were kept under surveillance and preparations could be made like Minato did. It's a minor problem.