The ongoing work on head modeling for the PIPER child model was presented at the Ircobi Conference 2016 in a paper entitled:
Development of a 3‐Year Old Child FE Head Model, Continuously Scalable from 1.5‐ to 6‐ Year‐Old (Chiara Giordano, Svein Kleiven)
It describes the methods used to make the model continuously scalable as a function of age