Board Thread:Episode Discussions/@comment-25319479-20180719110008/@comment-36049433-20180720205733

UltimaDude wrote: The whisker marks are a mutation caused Kurama's chakra influencing Naruto's genes. This mutation was passed down to his children.

No. Naruto had whisker marks before he became the Jinchuriki of Kurama. A newborn Naruto from Kushina already had whiskers, check for yourself. Naruto's kids having whiskers could be as simple as a genetic coincidence (that is - that they both got the whiskers)