Proper age to introduce rice cereal?

My baby was 8lbs 8oz at birth he is both breast and formula mostly breast fed he now weighs almost 14lbs hes going to be 3 months on sept 10th hes teething already and when i give him the tablets he opens his mouth for my finger and swallows, he smiles, coos, has been sitting with help for awhile now, i was just woundering what would be a proper age to introduce cereal to him? Thanks everyone
It seems like nothing is satisfying him though
 
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