Children do not fit in with your career. If this is your goal, do not have children. It would not be fair to them.

I don’t think there really is a ‘best time.’ You just make it work for you

I think establish your career, but don’t wait too long putting off kids if that’s what you really want.

This really depends on the job/career you have and how long you’ve been at the same place. If you feel secure in your employment and have gained enough experience at what you do, then I think it’s safe to take time off for a baby.

Does a baby fit in with your career, or does your career fit in with with your baby. Or even more, do you yourself fit in with your career or does your career fit in with you.
How important is your career ?
And how important are your other dreams and desires ?
You live only once….