I personally think all abortion past 20 weeks should be banned, except for life of mother and child.
They didn't even draw fluid for my anmio-centisis until I was 19 weeks pregnant and it took three weeks for the results. You would ban any woman over 40 from obtaining an abortion if the amnio-centisis test found fetal abnormalities.
Or did you even consider that such a decision might not be possible at 20 weeks?