if you made the right choice for you and your child then what is there to feel guilty for?
I agree with this. I'm a firm believer that no-one can make you feel guilty if there isn't something there for them to work on in the first place.
In order to feel better about these messages which are simply just following an interpretation of advertising legislation, you've got to first get rid of any feelings you already have about FFing. Everyone who makes the choice, does so for their own reasons and no-one should be able to make you feel bad if you've done something with the best of intentions and which suits your unique situation.
I was able to breastfeed, but given Abby's difficult start, it wasn't at all certain that I would be able to. I hated the idea of having to FF as my whole family breastfed their children (except for my sister with her lactose intolerant son) I beat myself up about it - more so because I already felt a failure for not being able to carry her for 9 months - and was near to breaking point when my husband pointed out that as long as she was being fed, it really didn't matter how. After that I relaxed and apparently so did Abby and we cracked it, but if she hadn't, I would not have felt any guilt at all about FFing.