It used to be that the guy checking IDs at the gym knew you by name. But a couple of kiddos later, you’re perfect strangers.

If maternal guilt is keeping your spandex from spin class, check that excuse at the door to Equinox. The fitness chain has partnered with Citibabes to replace standard-issue child care with interactive, developmentally appropriate programming based on Citibabes’ classes and teaching methods.

While you’re sweating it out, well-trained and certified staff members (with backgrounds in early childhood education) will engage your tots in activities based on the Citicircuit curriculum: stories, art, music, building, and play.

Projects vary daily — parents can check the schedule ahead of time and plan workouts accordingly — and always result in a cool take-home project.

So you can feel good about the time they’ve spent — and your ass.

Available at Equinox, 54 Murray Street, between Church Street and West Broadway (212-566-6555); 2465 Broadway, between 91st and 92nd Streets (212-799-1818 or equinox.com). Classes will roll out at clubs throughout the city by the end of the year, call gyms for pricing. Reservations required.

WIN
Apple Seeds Membership Raffle
What: Buy tickets ($5 each or five for $20) to support Cookies for Kids Cancer and hope you win a one-year membership that includes unlimited access to the awesome indoor playground.
Why: All proceeds go toward pediatric cancer research.
When: Now. The winner will be announced this Thursday.
Where: 10 W. 25th St., at Broadway; by phone order (212-792-7590).

LISTEN
Timbalooloo with Oran Etkin
What: The local favorite takes kids on a musical journey spanning multiple continents and instruments.
Why: They’ll be dancing in the streets, er, aisles.
When: Sun., 2 p.m.
Where: The Jewish Museum, 1109 Fifth Ave., at 92nd St. (212-423-3200). Adults, $16; children, $11.

SHOP
Sweet William Sample Sale
What: Deep discounts on all the hipper-than-hip kids’ clothes, shoes, and jewelry on the store floor.
Why: Indie style on the cheap.
When: Wed., 11 a.m.-7 p.m.
Where: 85 Kenmare St., b/t Mulberry St. & Cleveland Pl. (212-343-7301).

Photo: Thinkstock