I have 4 kids,
1st child had mild eczema that started at 1yr, and outgrown by 5ys
2nd child no eczema,mild hay fever.
3rd. showed 3 signs of food allergy in a breast fed baby before three months of age, eczema day 10 after birth, poor sleep pattern and poor weight gain despite feeding well.
food allergy connection and environmental allergies showed up from 1 yr onwards. has life long allergies.
4th child, eczema , very mild, easy to control at 2yrs, occasional flare ups connected to soaps/shampoos and conditioners. fast forward to teens, food intolerence and food and environmental allergies. controllable, under investigation with medical peeps.
genetic link in our family, eczema, environmental and animal allergies, asthma.
all my side of extended family have some form of allergic disease, I have eczema, my partner has adult onset asthma and hay fever.
if it happens you deal with it, allergies can happen at any stage of life if its genetic.