Along with giving birth to her fourth child this month, Stella McCartney is also delivering her first Stella McCartney Kids collection for Gap, which arrives in stores today.

After designing an uber-successful mini-collection for GapKids late last year (who can forget the cool band jacket that made fans of kids and Carla Bruni alike!), McCartney's new collection, for infants to age 12, is bigger and even has it's own interactive website at stellamccartneykids.com that kids and parents are sure to love.

Naturally, the new line, which is all vegan and mostly unisex, has numerous items that have us wishing we were 10 sizes smaller, including thick and cozy cable knit and fair isle sweaters, skinny jeans in hip washes, tees and sweatshirts printed with cute images of animals, bright yellow wellies, corduroy bloomers, navy peacoats, a painfully chic cropped burgundy trench and another sure to be cult-collected military jacket.

For infants and toddlers, there are wool cashmere onesies and easy organic cotton tops and leggings that come in sophisticated colors (aka there's not a stitch of baby blue or pink in sight).

The collection is highlighted to perfection in the new colorful Stella McCartney Kids ad which shows a bunch of ankle biters making funny faces, dancing, playing and generally making a mess while a rap song about donuts plays in the background.

A kind word of advice: run, don't walk, to Gap before everything is sold out.

Click here to watch the too-cute-for-words commercial.

While McCartney herself couldn't make it, check out which designers did show to WWD's glam 100th anniversary party.