Pregnant mom Kim Kardashian and husband Kanye West are apparently battling over their 2-year-old daughter North West's hair, of all things, according to Radar Online.

The couple, who are expecting their second child, a boy, next month, are locked in a dead heat over whether to let North's natural frizzy curls flow loosely or whether she should keep wearing her hair up in a tight bun the way Kim likes to do it, a source admits.

kim kardashian, kanye west and north west

Kim Kardashian, Kanye West and North West with her hair pulled back in a severe bun.

RELATED: North West Is by Far the Most Stylish Tot to Ever Grace a Ballet Class!

The 35-year-old reality star is, not surprisingly, "obsessed" with her little girl's appearance in public (she's the same way about her own looks, after all!) and doesn't like North's hair down. She "wishes North had straight hair," the insider says.

But the up-do solution she's come up with isn't good for North, who complains that her head hurts. So Kanye has intervened, insisting North be allowed out with her hair flowing naturally.

kim kardashian, kanye west and north west
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Kim Kardashian, Kanye West and little North with her hair down.

Get more details of the blowout between Kim and Kanye over North's hair—and see lots of pictures of the tot's various looks—by clicking through our gallery. Let's hope they'll stop arguing soon and just let their sweet girl be comfortable. She's adorable no matter what!