This seems plausible but not large or clear enough to convince me. I do not support 'scheduled' C-sections unless they are medically necessary for the health of mother or child. The natural build up of stress is what babies are programmed for. I have wondered if sudden extended exposure to cold/light/loud noise or lack of affection could trigger a PTSD type reaction in the hippocampus.

Researchers at Karolinska Institutet believe they have discovered the DNA mutations that explain why children delivered by planned Caesarean are at a higher risk for immunological diseases such as asthma, cancer and diabetes.
TheLocal