I am hoping you have prepared yourself for this tutorial by reading the first page, if not go back and read it!
Goto your rez file and pick a rez code for a 3 ponied little girl:
|agx.lnz||Asian Girl, one and three ponies|
|bgx.lnz||Black Girl, one and three ponies|
|brgx.lnz||Tan Girl, one and three ponies|
|wgx.lnz||White Girl, one and three ponies|
Scroll down to where it says D;Hair- 3 ponytails ;0n head by using the below picture make your rez file look identical to mine.
Let's have a look at what you have done by picking a code from Small & Pampered (make sure it is a baby that matches to the type you are hexing), save the Hex Workshop, say no that you do not want to make a Back Up and then open babyz and enter the code. If it doesn't work first time, try a different code.
I am sorry if this one has confused you more than anything, but it is really hard to explain.