(For a quick tutorial or refresher on how to fold clothes using the KonMari method, visit this post first. Note that I use my own modified KonMari technique to fold baby clothing as they are smaller than adult clothing. Marie Kondo does not discuss folding baby clothing in her book.)
After clearing out my closet, I worked on Baby Phil's clothes. First, I piled all of his clothes and baby linens on top of my bed. Anything that no longer fits Phil belongs in the "Giveaway or Donation" pile. Thankfully for me, a lot of my friends and cousins are fertile and having boys! Sorting the clothes first makes my life easier; thus, pants go with pants, onesies with other onesies, sweaters with sweaters, and etc...
Let's start with folding onesies.
Lay it flat so that the front is against the bed. Fold the sleeves. Imagine you are turning the onesie into a symmetrical rectangle. Now you can fold the onesie in half, into a long rectangle to roll it into a sushi roll for storage. Or, instead of folding in half and rolling, fold in the sides, both midway, so that you have a thinner rectangle. Now fold this into a smaller, more compact rectangle, length-wise to achieve number 5 in the picture below.
The key is to remember that you want flat, compact rectangular shapes or like and compact rolls. When you're folding or rolling, you are smoothing out the clothes and never pulling them taut or torturing them. You can apply some compression to flatten your end-result rectangles. The KonMari Method of folding should actually bring you peace and makes folding and sorting clothes relaxing and enjoyable.
Have you tried the KonMari method yet? Using Marie Kondo's methods and my modified methods, you can fold just about any piece of clothing (socks, jeans, tights, sweaters, vests, onesies, overalls, etc...) into a neat roll or rectangle for storage or "filing." Marie Kondo believes in vertical storage. So instead of piling clothes on top of each other, you file them vertically next to each other as if they're documents in a file cabinet.
I hope you've enjoyed this tutorial! Let me know if you have any questions!