In the case of something like trisomy or massive congenital issues, most babies die within hours of birth, sometimes in utero. Some parents believe it is better to end it's suffering.
and this is why, despite aborting for gender making me feel ill, I accept there has to be choice. I readily recognise not everyone holds my views and I would never expect another woman to keep a child based on my own opinion.And (and this is the clincher!) if we are to accept that different people have different definitions of these things and different thresholds with which they're comfortable, then we are free to label ourselves "pro-choice" and accept that while something might contravene our beliefs, it does not contravene everybody's.