Safest (as in least likely to offend) ways would be to use "he/she" or rephrase w/o the gendered pronoun as in "when was your child born?". Traditionally, male

Safest (as in least likely to offend) ways would be to use "he/she" or rephrase w/o the gendered pronoun as in "when was your child born?". Traditionally, male-gendered is used for unknown sex, though some object to that.