"I hear girls tell me that boys are giving them ratings. 'You're a two. You're an eight.' So if they also have mothers who are very focused on their looks by saying they need facials, that's reinforcing that message that their looks are very important and mothers need to de-emphasize that," Cohen-Sandler said.
The author advised mothers to treat spa days as a luxury and enjoy the time bonding with their daughters.
"Mother needs to be very mindful of the messages she's giving her daughter," Cohen-Sandler said. "If she's telling her daughter, 'This is something we need routinely,' that's a message that will be harmful."
But some mothers insist mom does know best when it comes to learning about proper skin-care habits.
"I do all these types of things myself and I think they're better off starting young," Kelly Burrus said. "It will teach them to take care of themselves and have pride."