I hate throwing things away, I am a terrible hoarder. Especially when I have a sentimental connection to it. So giving or throwing away trashed baby grows I find hard. As for each one he grows out of means my baby is getting older and older. So I saved a few of my fave's that are a bit too stained to be passed on, and have made some dribble bibs for Rex out of them.
All you need to do is cut the largest part of the baby grow or vest into a triangle. Fold the edges over and topstitch with a zigzag stitch. That's it.