Eczema in babies and children most often occurs where the skin flexes — inside the elbows and behind the knees1. Where skin creases, skin is more susceptible to rubbing and irritation. Increased sweating in these areas can also dry out the skin2. In babies, eczema mainly appears on the cheeks and the outer surfaces of the arms and legs and – less commonly on the back, stomach and chest. Children, teenagers and adults who have eczema are most commonly affected on the backs of their knees, the insides of their elbows and the back of the neck3.   References; Adult vs child atopic dermatitis. Adult vs child atopic dermatitis (dermatologytimes.com) Eczema Causes & Triggers - National Eczema Association: Eczema Causes & Triggers | National Eczema Association Eczema overview - NIH: InformedHealth.org [Internet]. Cologne, Germany: Institute for Quality and Efficiency in Health Care (IQWiG); 2006-. Eczema: Descripcíon. 2013 Sep 26 [Updated 2017 Feb 23]. Available from: https://www.ncbi.nlm.nih.gov/books/NBK279399/