We have different EEG sizes for babies, cover the sizes from 36 for newborn, 38 to 40 for babies with 3 months, 42 to 44 for 7 months and 46 to 48 for 3 years.
With two cap sizes for every age range you will cover 70% of subjects, with three sizes over 95%.
you can learn more about options for EEG clicking here