DH and I plan to start TTC in the new year but open enrollments for our medical FSA are right now. Last time we were due in April, so we went ahead and put a bunch in to pay for the cost of the birth. This time its iffy if we will have a baby in 2019 or not, so I don't plan to risk it. But then it occurred to me that a birth counts as a qualifying change. So could I increase it possibly at the very end of the year and then still use those funds to pay for the birth? I know it would have to all come out of my check at the very end since it wouldn't be spread out throughout the year. Has anyone done this or know more than I do about how it works?