happy post?

This was going to be such a happy post! I have almost completed all of the pieces for the a boy's own jacket. That sounds pretty good, doesn't it? The only problem is the height of the hood is almost equal to the height of the jacket body!? Now that can't be right. So I searched for errata on Zoe Mellor's book Nursery Knits and found this link on KnittingHelp.com. Unfortunately, it doesn't list any corrections for my project. Someone else posted pictures of their work in progress here. The hood looks much better. I think s/he is making a smaller size.

The hood instructions are a little ambiguous but I did my best to decipher them. Maybe you can point out my error.

The pattern reads:

The decreases worked okay. It is the increases where I had my problem. There are 3 sizes for this pattern (6-12 months, 1-2 years, 2-3 years), and differences in size are usually noted like so: Cast on 62 (66:70) sts. Since I am making the largest size I followed the last number between the brackets and after the colon. For the increases I interpreted the and as a colon.

I think I will try using the first number within the brackets for my increase rows. Any other ideas/suggestions?