Both my boys started solids shortly after 4 months. I wasn't really in any great hurry, they were just trying to take my dinner. I did BLS with DS2 and it was really good, I just gave him a few pieces of meat and veg to chew on while we ate dinner to keep him happy. I didn't worry about how much he was actually eating until he was 6 months.
Personally, I wouldn't worry about solids unless bub is telling you they want it.