Board Thread:Naruto Discussions/@comment-26508646-20150705183625/@comment-25632268-20150705213935

In case of Boruto and Himawari whiskers don't necessary mean Kurama's influence. They can simply be an inherited physical trait. In case of Naruto they came from Kurama because Kushina was a jinchuuriki and the body transfers a chakra to baby during pregnancy, so some of fox' chakra could slip into Naruto then. Hinata is not a jinchuriki, when she was pregnant only her chakra was transferred to baby growing in her womb.

JOA20 wrote: But I don't think Naruto's sons can enter any of their father's modes, unless they're given some more chakra from the Nine-Tails or trained in some way.

Naruto has only one son, Himawari is a girl :)