Little Sally mastered the potty six months ago, but you can’t give up your beloved diaper bag. It’s the last line of defense against a day’s worth of near-catastrophes (bless you crayons, goldfish, and spare socks).

Lighten your load with 7 A.M. Enfant’s new Barcelona bag. Made from the same machine-washable, water-repellent shell as the company’s legendary stroller bunting, it weighs next to nothing but can withstand almost anything.

A multitude of pockets (inside and out) means supplies are in easy reach; a slender shape offers impressive capacity without that I’m-packin’-wipes vibe. Plus, a removable insulated compartment keeps snacks and drinks fresh for all-day refueling.

Just be sure there’s a bathroom nearby.

Available online at 7amenfant.com, $90.

SEE
Knuffly Bunny: a Cautionary Musical
What: The comical, heartwarming musical-theater adaptation of Mo Willems’s award-winning children’s story.
Why: You won’t mind reading the book over and over for weeks after.
When: Sat., 11 a.m., 2 & 5 p.m.; Sun., 11 a.m. & 2 p.m.
Where: NYU Skirball Center, 566 LaGuardia Pl., at Washington Square S. Tickets at 212-352-3101 or online at skirballcenter.nyu.edu. Adults and children, $15-$25.

LEARN
Secrets in the City for New Moms
What: A crash course in the best playgrounds, classes, and stores; plus useful info like the cleanest public restrooms with changing tables.
Why: You don’t know jack.
When: Tues., 11:30 a.m.
Where: Kidville, 163 E. 84th St., b/t Lexington & Third Aves. To register, call 917-488-8542 or e-mail lunch@bigcitymoms.com. Tickets, $35 in advance/$40 at the door.

EXPLORE
Brooklyn Botanic Garden Discovery Week
What: Kids learn about desert and rain forest flora through hands-on activities in the conservatory.
Why: The lesson continues with a plant to take home.
When: Mon.-Thurs., 1-3 p.m.
Where: 900 Washington Ave., at Carroll St., Prospect Heights (718-623-7200). Adults, $8; children under 12, free.

Photo: Courtesy of 7 A.M. Enfant