I have gotten a lot of requests on how to change my dresses to different sizes. That request is hard for me, since I never made the dresses into different sizes, or wrote the patterns down.
So I did some research on the easiest ways to make different sizes.
Most of the time, you can change the size of the dress by the size of yarn and hook you use.
If I used a size G hook with medium weight yarn in my tutorial, to make a 12 mo size, then you could use thicker yarn and an I hook to make a 18 -24 mo size.
If you wanted it smaller, than you could use a baby weight yarn, with an E hook.
Do a test strip (usually the bottom of the bodice), to see how the measurement comes out, using different hooks and weights of yarn. Use the measurements below as a guidleline.
So, if you wanted to make a dress for a 18 month old girl, crochet a few rows of 11" across. My basic dress is made by making a front and a back and then sewing them together, so the dress waist measurement, should be half of the total waist measurement + 1 inch (depending on how roomy you want it to be, and sewing room).
If the dress is made by starting with a collar, then make the collar bigger or smaller, to fit your child. Use a four stitch per size, foundation chain change. (Example 46 ch, for a 6 mo, 50 for a 12 mo, 54 for an 18 mo, etc.) If you are making the dress for a 24 month or older, then you would need to add some rows to the bottom of the collar as well.
I hope these measurements help you to customize my dresses to whatever size you need.
The best idea, is to keep fitting it to your little girl as you go along. For my first dress that I made, I had to keep taking out my stitches and making it smaller. I kept over estimating how big to make it.
These are measurements that I got off of Simplicity's website, and are just guidelines. (Measurements are in inches.)