I think you have to be careful not to go completely overboard. The sugar in shreddies is mainly from malted wheat to again not refined. I alternate things like shreddies and rice krispies with completely no added sugar options but I don't think they're that bad. If you're really concerned, ready brek or home made porridge are good options. I don't like giving the 'baby' cereals for too long tbh because even some of them are surprisingly high in sugar and they're so expensive. Most of his breakfasts till he was 1 were ready brek but at some point i felt I needed to ease up, albeit not giving chocolate cereals mind!!!