Different kid will have different body system immunity. You may watch for food intake taken by second child and see if she/he has any reactions to certain type of food, display any redness, dry skin, rashes that doesn't heal, scratching or whatever that triggers the body system. Take not of it in your own food journal and either you avoid or you lessen it.
I have my my nephew and niece (all 3 siblings) and they all have eczema but has different type of eczema/allergy to different types of food. So they do test, food journal, avoid or reduce.
Some have history of eczema through history. So maybe you can just do more googling or seek advice from gynae/doctor. For allergy/eczema can't be prevented if bound to happened, we just have to minimize or avoid or susbtitute.
Hope this helps.
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