Interviewer instructions
83. Record the person's sex by writing 'M' for males and 'F' for females. Check that the sex is compatible with relationship - don't write 'M' for persons shown as wives or daughters, nor 'F' for persons shown as sons or husbands.
84. Take particular care to record the sex of very young children correctly. Often you will not know whether a baby carried on its mother's back is a boy or a girl, in such cases you must ask -- don't guess.