F1 vs F1b Goldendoodles

So what is the difference between first generation Goldendoodles and second gen?

F1 Goldendoodles, or First Generation, are puppies that come from a purebred Poodle and purebred Golden Retriever. They are Hypo-Allergenic but still retain the wider head and teddy bear characteristics of the Golden Retriever.

F1b Goldendoodles are a cross breed of an F1 Goldendoodle and a Poodle. This additional cross with a poodle makes the puppies' fur more curly than wavy but also reduces the level of fur to make them all but impossible to be allergic to. Their heads tend to be more long and slim, like the Poodle, than the traditional wider Goldendoodle look.

I found this helpful chart on Pinterest...