Has anyone used Farley's rusks before 4 months?

i have a 10 week old and he is taking an eight once bottle, and i think he will be be needing to go onto baby food sooner than 4 months. he is a bigger baby he weighed 10lbs 3 oz at birth and he was weighed a few weeks ago and was 13lbs. has anyone used rusks or any other baby food before 4months?