Little girls getting "grown" hair styles

I have heard this complaint from various stylist how more and more mothers are allowing their little girls to get "grown" hair styles. I have a few questions about this one : What is considered a "grown" hair style? Whats wrong with the child having her hair down in a straight parted on the side or in the middle style?Ive seen other children walking around like this(mostly of other races but yeah just parted in the middle nothing extra just straight down) Does this automatically make the child look older? I mean a 7 yr old with their hair parted down the middle still looks like a 7 yr old right? I remember hating those baby doll curl things when i was little but i also remember my mama saying i was too young to have my hair straight id always have to wear pigtails or babydoll curls. Is this a cultural thing? I dont know i dont have any kids can anyone explain please .