We caught up with Jenny Cooper, head designer for the J.Crew's adorable Crewcuts collection, for a typical day in her life.

Morning

5:15 a.m. I gasp my way around the track at Cadman Plaza near my house in Brooklyn.

6 a.m. Back home, I find Walker, 9, and Miller, 7, playing soccer with a stuffed lobster.

6:30 a.m. The boys can play 30 minutes of FIFA Soccer 12 before school if they make their beds and brush their teeth by 7:30. They get it done by 6:45.

11 a.m. I'm surrounded by 5-year-old models at a fitting for the Spring 2013 Crewcuts collection. I ask the kids to jump up and down to make sure they can move comfortably and the clothes still look cute.

Afternoon

1:20 p.m. I treat myself to a Justin's Organic dark-chocolate peanut butter cup. Yum—I would live on them exclusively if I could!

3:15 p.m. Forward an e-mail to the team from a friend who spots a Crewcuts dress on the street. Squeals all around!

4 p.m. Meet with the knit team to review sketches for Summer 2013. We're all loving the pops of neon.

Evening

7 p.m. I nibble on leftover chicken tenders while helping Walker build a paper city for his urban planning project. His buildings come out much better than mine.

8 p.m. I'm in bed with Miller. Ever since he got a bit of a scared watching ET, the only way to get him to sleep is by reading The Lorax five times.

8:55 p.m. I pull up Netflix and watch Inspector Lewis on my iPad. Nothing beats a good murder before bedtime.

Plus:

• Q&A With Heidi Klum
• Cynthia Rowley Lets Kids Wear What They Want
• Kids Choose Tech Over Clothes for Back-to-School