I'm still loving Handmade Beginnings: 24 Sewing Projects to Welcome Baby. After sewing the hoodie and booties I moved on to the pants.
The pants are the size 6-9 months. They are definitely intended to have the cuff rolled up. When it is unrolled, the pants fit my 19 month old. And she's not tiny so if you are planning to make pants just be aware that they are baggy and have the potential to grow with your child. That's a bonus in my book.