My male colleague said that I have children and he is not married. What should I do?

You don't have to care and you don't have to respond tactfully.

1, don't care: the personal situation of a male colleague has nothing to do with himself, so he can choose to ignore his colleagues' comments and continue to concentrate on his work and life without being disturbed.

2, witty response: If you feel that the comments of male colleagues are a bit uncomfortable, you can respond appropriately. You can express your different opinions, such as "I think getting married and having children is a personal choice, not something you have to do."