I plan to start shell fish only after 3 or 4 yrs of age. That includes scallop and prawns. My boy is pretty allergic so I'd rather not risk it. Every new thing I try now I will wait it out to see if there're any new allergic reactions.
Recently I found out my boy still hasn't outgrown his corn allergy.
We introduced rice from porridge to dry porridge to mushy rice to rice with soup.
Mushy rice we will cook seperately in a pot. Or if we cooked rice that day for dinner, we would add take out abit, add some water to it and steam it for a while to make it mushy.