Posted by Susie1 (1105 days ago)
Could it be that your baby is teething? they sometimes get red cheeks and rub their mouth because of the pain of teeth coming through. If he/she is teething, cool a teething ring in the fridge (not freezer), the coolness will help with the pain and swelling in the gums.
It may not necessarily be an allergy to the foods you gave him/her, just lay off from that particular food for a few weeks, then try it again when your baby is otherwise OK, if the cheeks get a red rash straight afterwards , then speak to your doctor.
(I am based in Hong Kong)