ting, you mean food allergy izzit? For me, when dear son 1st start solid, i let him try 1 new food at a time so that i can know if he has allergy to that particular food. Eg, i give mashed carrots then next day i give pork porriage. If he's okie, then i'll give carrot+pork porriage. Also have to use fresh ingredients for their food. If the pork is oredi in the freezer for >3days, then i wun use it, i've to buy fresh one.