For

• Evidence 1:

  • Men are not psychologically equipped to form this kind of internal emotional bond, eg: oestrogen
  • As a result, societal expectations suggest females are emotionally equipped to look after a child
  • Heerman found men are indeed less sensitive to infant cues than mothers
• Evidence 2;

  • Buss: variations between men and women are due to reproduction. The mothers have higher investment as they carried the baby

  THEREFORE: suggests biologically why women are the primary caregivers