The LA has chicken meal in it. If they ever had a fish and sweet potato forumla, i am not aware of it. It might have been a very long time ago. Now they only have the regular formula and the weight loss formula. I do have free samples if you would like to try it out on your babies to see if they can eat it ok.
If they truly have a chicken allergy, i wouldn't recommend it.
They do have a wonderful tablet called Skin and Coat which has the Omega 3 fish oil along with other wonderful ingredients that helps tremendously with allergies and builds up their immunities.