https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4726418/
https://pubmed.ncbi.nlm.nih.gov/16814961/
https://www.researchgate.net/publication/222673203_Sex_Differences_in_Human_Neonatal_Social_Perception
https://linkinghub.elsevier.com/retrieve/pii/S0163638300000321