They call it the allergic march - starts out as eczema, then food allergies, then asthma, then seasonal allergies. Ds1 has the first three, and I'm pretty sure he has seasonal as well. Doesn't mean you can't have them singley (sp?), but they of4en come together. It's why I asked if your second child had eczema. I'm not sure about the correlation of birthing method and allergies, but all three 8f my kids are c/s and the younger two have food allergies. Hth