When Nicole Richie and Joel Madden welcome their first child next month, the little one will already have the perfect wardrobe –thanks to Dad and Uncle Benji. The Good Charlotte rockers have added a baby line of hoodies ($45), onesies ($26), and tees ($23) to their DCMA Collective brand in anticipation of Baby Madden’s birth. “I was inspired to make baby clothes because I’m excited to share something I love with my kid. I think it would be really awesome for me and the baby to dress alike,” Joel tells PEOPLE. The black-and-white line features mini-versions of DCMA designs including their trademark brass-knuckle logo and other cute but rock-inspired details like skulls, lightening bolts, hearts and roses. Even sweeter: a portion of sales will benefit the expectant couple’s new Richie-Madden Children’s Foundation. “Not only do I want to teach my child how to own something, but also how to contribute to the community,” says Joel, who hopes to launch a kids’ shoe line next summer. Hoodies, onesies and tees are currently available in two sizes (3-6 months and 6-12 months) exclusively at dcmacollective.com.