What age pwede pakainin ng cereals ang kids?

I recently started feeding my 7-month-old with whole grain. I tried to give him brown rice and rolled oats mixed with various fruits and veggies. A while ago, he ate brown rice + carrots + sigarilyas and he likes it! I think it's safe to give it around this kind of time IF you started solids at around 6 months. My baby's solid foods for the first month were of mushy kinds because it can be digested easily. Now that he qquite got the hang of eating solids, I gave him whole grains.