Congrats on the puppies!
I feed my pups soaked dry puppy food when they are around 4 weeks old.... basically just to learn how to lap up food. By 5 weeks they are doing better with it.
I have a litter now which are 6 1/2 weeks old... they've been fully weaned from mom since Monday (when they were exactly 6 weeks old). I still feed them soaked puppy food three times a day... I mix in a teaspoon of turkey or chicken baby food into the soaked food just for flavor... and dry food and water is always available to them... They seem to be eating the dry food also... instead of just playing with it like they were.
Not to brag... but all three of these pup seem "fully" pee pad trained... I haven't had any accidents for a few days.... not bad... eh?
Best of luck with your little ones!!