Hi thanks for writing here.It seems your child has been suffering from atopic dermatitis
.It will be better you consult a dermatologist
,but few things you can keep in mind.1.Use a mild soap or body wash,you can ask your dermatologist for a soap or a syndent bar.2.Always apply good amount of emollient
moisturising cream immediately after bathing.Use it round the year.3.Use loose cotton clothes covering whole body,avoid wollen clothes.4.Use luke warm water for bathing.5.Do not make steroid
ointements as a habit,use them only on and off basis,use only when disease is flared up .6.Give him sedative antihistaminics like atarax 7.See that your house is free from dust particles .Take care.