Disclosure: The post Birchbox + Baby Gap Collaboration Spoilers contains affiliate links Birchbox has a collaboration with Baby Gap coming March 17th! The babyGap + Birchbox Limited Edition Box will be released March 17th! Big City Moms (@bigcitymoms) posted on instagram a photo of the box. You can see the picture HERE. I don’t know the details, but stay tuned to my blog, and I will posted everything when it launches. Here is what we know about the box: