At that age I used to give the packet baby breakfasts e.g. Cow and Gate, Farleys, Baby organix, Boots, etc There is loads of variety and I'm sure you could find something that your lo likes. As an alternative you could give plain fruit puree or fromage frais e.g. Baby Danone which is made from follow on milk. Once your lo reaches 6 months you can give foods containing gluten e.g. Weetabix, Ready Brek, etc and add fruit puree if necessary to give different flavours.
hth
Seona