alot of people here seem to start early (around 4-5 months). The American Acamdemy of Pediatrics says to start at 6 months. Personally, we're going to wait until 6 months, skip the cereal and start with veggies/fruit. I am most comfortable with that plan after all the reading/research I've done.
I have also done a lot of research and reading and except for the WHO, I have read everywhere that solids should be started between 4 and 6 months and preferably no later than 6 months. So, I wouldn't consider 4 months early but that's just my opinion.
Re: cereal/solids