I know it's hard to tell from a photo, so I will tell you. These are supposed to fit a 12-18 month old. Instead I will be letting my 4 year old (granted she's tall and lean, but typically she wears a size 4) wear them as capris. Then when summer's over I will save them until my almost 1 year old is able to wear them. They are adorable though. What with the bugs on them and all. And if he ever wears them in the winter around Christmas he'll match his stocking. I believe in using every square inch of fabric possible.
I'm currently working on a new pair that I found in this book Making Children's Clothes by Emma Hardy. I used the baby bloomers pattern and improvised a whole lot. When I first sewed them and turned them right side out he had a tail. They look like tail-less pants now. I'm just adding some embellishments.
Also, you should go check out Donna's blog. She's a former classmate of mine who all too recently lost her son to pediatric cancer. She's now looking at ways to help raise money for research. It's amazing, but be prepared to cry (especially if you have children).