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from the http://www.wonderweeks.com website:

A leap in the mental development of your baby means that suddenly there are many changes in his head. Suddenly, his brain perceives things it wasn’t capable of perceiving before. This change is so great that his entire world suddenly looks different.

Wonder Weeks and Fussy Periods:
Wonder Week 5 - fussiness starts around 5 weeks and usually lasts 1-7 days.
Wonder Week 8 - fussiness starts around 8 weeks and usually lasts 3-14 days
Wonder Week 12 - fussiness starts around 12 weeks/2.8 months and usually lasts 1-7 days
Wonder Week 19 - fussiness starts around 15 weeks/3.5 months, peaks at 17 weeks and skills appear around 19 weeks. It usually lasts 1-6 weeks **From now on Fussy periods will last longer than previously
Wonder Week 26 - fussiness starts around 23 weeks/5.3 months, peaks at 26 weeks and skills appear around 26 weeks. It usually lasts 1-5 weeks
Weeks 29/30 or 6.8 months - This isn't actually a Wonder Week, but many babies act fussy during this time as they begin to understand that their mommy can leave them. Just thought I'd let you know
Wonder Week 37 - fussiness starts around 34 weeks/7.8 months, peaks at 36 weeks and skills appear around 37 weeks. It usually lasts 3-6 weeks
Wonder Week 46 - fussiness starts around 42 weeks/9.7 months, peaks at 44 weeks and skills appear around 46 weeks. It usually lasts 3-7 weeks
Wonder Week 55 - fussiness starts around 51 weeks/11.7 months, often peaks at 53 weeks and skills appear around 55 weeks. It usually lasts 3-6 weeks
Wonder Week 64 / 14.7 months
Wonder Week 75 / 17.2 months
Over 20 months - Other wonder weeks have been documented throughout childhood. It is also suspected that adults even go through some wonder weeks.