When do I switch from a milk replacer to the 2nd step weaning food?

Kittens or puppies that are steady on their feet and lapping from a bowl (4 to 5 weeks of age) may be introduced to KMR/Esbilac 2nd Step. It is recommended that KMR & Esbilac 2nd Step be fed until kittens/puppies are ready to transition to solid food (7 to 8 weeks of age).