Board Thread:Episode Discussions/@comment-25319479-20180719110008/@comment-31396703-20180720202124

They either got the whiskers because Naruto was born with them and thus passed them down. Or because Kurama's chakra was less saturated due to being in the sperm and not in the womb. It seems that the womb or stomach is highly related to the Eight Trigrams seal. We also don't know if Mito's children had any whiskers