It's not difficult to find sewing tutorials on internet and learn by yourself.
I've found a tutorial on baby crib sheet.
For mothers in Taiwan, you may have asked this question:
Where to buy a single baby crib sheet?
The Answer: I don't know either.
I once tried to find a crib sheet for us, so we can change it easily.
Unfortunately they only sell 6 pc set baby beddings in Taiwan. (Unbelievable!)
So I found one American single sheet on Yahoo! bid, which was not cheap at all.
Here is my first handmade baby crib sheet, with elastics at both ends, just like those on the market. This tutorial is to hide the elastics inside the hem. (Our first sheet from Taiwan has the elastic sewn right on the hem.)
The author (Joanna Armour) of the tutorial is also a mother. You can tell from her thoughtful works.
This crib sheet will be a gift for my nephew, Wei-Zeh.
The tutorials can be found at: http://www.makingitfun.blogspot.com/