As part of my job I examine newborn babies as part of their routine screening examination.
www.nhs.uk/conditions/pregnancy-and-baby/newborn-physical-exam/
And here www.gov.uk/government/collections/newborn-and-infant-physical-examination-clinical-guidance
All results are uploaded to a national spine , certainly in England at least.
Guess what this records?
Gender
You can be male, female, unsure or prefer not to say
Any mention of Sex on the form... of course not. Within 48hours of life we have already ignored Sex.