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A karyotype is a way to find out if a baby has an atypical number of chromosomes. However, the anormal chromosomes cannot be fixed. For this reason, a karyotype is necessary to understand the situation before the birth of the baby. If there is a big possibility of atypical number of chromosomes for a baby and the family doesn't want  a baby that has the illness, karyotype is necessary. There are two steps to understand if karyotype is necessary.
1. Does the family want the baby whether or not if the baby has the anormality?
If yes, the karyotype is not necessary.
2.If the answer for the first question is no, is there a big possibility of having anormal numbers of chromosomes for the baby?
If yes, the karyotype is necessary.
First question is about the family decision, and the second question is about the doctors predictions.
First question should be answered by the family absolutely taking informations from the doctors. Nobody has power to take the decision of aborting a baby without the decision of the family.
If I found out that my future child had a chromosomal anormaly that would make him or her very different from other children, I would not make him or her to have a life like that. Every parent want to make their children to have better lives. If my child would not able to breath without help, I would not make him or her to live.