I used porridge made quite runny @ first & then slowly graduating to more solid. when they are weaned I then gave them porridge in the morning & for supper & two small meals of fine minced beed with parmesan sprinkled over in between, They have all loved it & thrived well. Have had Bulldogs for years & they have all done well on this & have good weight & shape.
I used mushed up puppy food that I had mom on and mixed up milk replacer.... Made it real runny, then slowly less replacer as they got older, tell it was dry puppy food.