my son is only 12 weeks old, however he is no longer lasting the 3 - 4 hours between feeds. he takes any thing from 4 -7 oz per feed. several people (family) have suggested i try baby rice, but is he not far t young to try this? what age does he need to be? i thought it was 6 months. My mum insists that because it would be a very small amount he will be fine! HELP!