IT'S One o'clock on a recent Saturday. Inside The Knitting Factory, a well-known local nightclub, loud music pulsates through a crowd of dancers, inviting them to "leave the nine to five up on the shelf, and just enjoy yourself." The mirror ball overhead sends light sparkles through the dimly lit room, illuminating the occasional beer bottle or cocktail in a partyer's hand.

Occasionally, though, it also lights up another kind of bottle, the kind that babies use, because this is not a late-night party. This 1 p.m. to 4 p.m. bash coincides with most children's afternoon naptime.

The event is a midday soiree specifically for the Mommy-and-me set – a nationwide phenomenon known as Baby Loves Disco. One afternoon each month, local organizers take over a nightclub – complete with a cash bar and the regular DJ spinning his normal playlist – and throw open the doors to anyone under the age of 7, accompanied by parents.

The two-year-old concept, now in 16 cities, has clearly struck a national nerve. It sells out every time it expands into a new city, just as it did this past month in Boston. But as Baby Loves Disco has outgrown its humble origins in Philadelphia, acquiring sponsors and partners along the way, the concept of combining babies and clubbing is coming under sharper scrutiny. Some child advocates call it downright dangerous while other cultural observers call it the latest sign of an ongoing fundamental shift in our attitudes toward children.

"One of the major premises revealed in [Baby Loves Disco] is that we've shifted from a child-friendly to an adult-driven lifestyle," says Lynne Griffin, an author and registered nurse who teaches in the Family Studies graduate program at Boston's Wheelock College. "What we're seeing increasingly is adults sharing a lifestyle with their children that is geared towards adult needs for everything from sleep to daily activities such as entertainment and communication."

Noting that parenting styles tend to go in cycles, many clinical experts dub this a period of permissive parenting, in which adults do not set appropriate boundaries between themselves and their offspring.

"I'm seeing parents who look at their children and say, 'He's just like me, so whatever is good for me is good for him,' " says Don MacMannis, a child psychologist who is codirector of The Family Therapy Institute of Santa Barbara, Calif.

This traveling, mixed-age homage to '70s and '80s club life began as a backyard party at founder Heather Murphy's home. A former dancer, Ms. Murphy says she and her husband wanted to share their favorite family activity with their friends.

"What we like to do is put on music, have a glass of wine and hang out with the kids," she says.

This private party quickly outgrew her home and she looked around town for a venue to rent. She picked a local nightclub because it was already set up for the kind of festive, music and dance party atmosphere she sought.

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