Hannah, starting solids can be a very confusing time. It is always difficult to know for sure, but given that the same thing happened twice, it is certainly possible that the cereal is upsetting your little one.

One of the great things about BLS is that you don't need to know when they are ready to start - you offer the food, and when they are ready, they eat. This approach might be helpful at this point in time. You can give her some steamed vegies, meat, fruit, whatever you like, and let her decide when she wants to eat it and how much. And there is no need for her to have cereal at all - it has no nutritional benefit at all, the added iron is not readily absorbed the body in that form anyway. Vegies are tastier and healthier, and meat is a very important early food.

All the best with it hun.