I just sent this email to Heinz via their web contact page.
Please if you have a free minute can you do the same and for the other companies that label their solids as suitable for 4-6 months.

Dear Sir/Madam,
I'm sure that you are aware of the WHO guidelines that state that babies should not start solids until after 6 months of age. I find it very disturbing that you're marketing solids as suitable for babies 4 months or over. In my opinion it is very irresponsible to mislead parents by suggesting implicitly through your labeling that solids are appropriate for such young babies.
I shall not be buying any Heinz products for babies or adults until such time as I notice that this is rectified.
Bellamy's baby foods are labeled correctly so I will choose their product instead of yours and encourage others to do the same.

Regards,
XXXXXXXXX
I'm trying to figure out which government bodies to harass about the issue - any ideas?

ETA Golden Circle

ETA - Bellamy's does label their food as suitable from 6 months. Please mention this so the other companies know that there is an alternative to their product.