Welcome, and beautifull dood. I breed F1b so I am more experienced with them. I can post a pic of our Hershey as a pup, she was a very flat coated F1 that has grown into a nice fleece non shedding coat. There is one of our F1bs in the second picture for comparison. I think she is the exception rather than the rule with flat coated puppies. I'll also post a pick of a firends dood that stayed shorter and has a sheddign coat for comparison. Sorry they are chocolate and not yellow..
Hershey as a pup
And as an adult, coat is clipped short for summer but is a wavy fleece coat
And the shedding straighter coat.