In a city where the average square foot of space will set you back more than $700, downsizing is a must.

Which can be hard, when all your family wants to do is grow.

So allow us to introduce you to the Quinny Zapp Stroller, a stylish ride that’s the Prius of the pram set. It folds into a compact model, so it’s ideal for families on the go in cramped taxis or trunkless cars. It works with Maxi-Cosi car seats, making it the perfect mode of transport for your little ones.

At least as long as they stay little.

Available at BuyBuy Baby, 270 Seventh Avenue, between 25th and 26th Streets (917-344-1555 or buybuybaby.com).

MEET
Judy Blume
What: Legendary author’s autographing copies of Soupy Saturdays with the Pain & the Great One.
Why: She’s super(fudge).
When: Sat., 2 p.m.
Where: Bank Street Bookstore, 2879 Broadway, at 112th St. (212-678-1654).

GET
Some Culture
What: Tours for Fours teaches tots (and their younger siblings) about contemporary art.
Why: Your number’s up.
When: Weekly. Sat. & Sun., 10:30-11:15 a.m.
Where: The Museum of Modern Art, 11 W. 53rd St., b/t 5th & 6th Aves. (212-708-9400).