As a mommy I would suggest making a diaper/wipe case holder. there was a fab tut on here for one that I modified for myself. You can make those up in a hour or so if you don't have distractions. I have made two in two days but I have limited sewing time and two kids under 5. I hope I also second making a changing blanket for the baby to have in the car. I have one and I love it. And you can also make a car storage box. connecting threads has a great pattern for one that I just made up. you could probably make your own pattern for one if you are supper tight on the time frame. I wish that I had had one a few years ago when I had my first baby. would have helped to keep the car cleaner.