Edit: image removed, forgot the medical images rule. Look it up if you really want to know.
Copied this description from elsewhere:
"skin: extremely thick scale encases the entire fetus; deep fissures in scale develop after birth; thick scale causes eversion of the lips (eclabium) and eyelids (ectropion); ears and digits may appear malformed, owing in part to the thick scale that envelops them
Associated findings: in some, none; short stature is common in survivors; neurologic, kidney and lung abnormalities have been described
Age at first appearance: birth
Long-term course: premature birth common; early death may occur from complications of prematurity and/or constriction caused by the thick scale, from infection or from dehydration; survivors have the appearance of lamellar ichthyosis or congenital ichthyosiform erythroderma
Diagnostic tests: skin biopsy for electron microscopy is highly suggestive
Abnormal gene: unknown; may have several causes"
Now, this particular birth defect is nearly always fatal, with survivors living for perhaps a few days in most cases.
However, care has improved, and more individuals are surviving this defect into adulthood.
Is this a medical victory? What does this say of evolution? Why would you not want the child to live? Why WOULD you want the child to live?
The discussion is specifically about this defect, but mention of others would obviously be valid and pertinent to the discussion.
Most men pursue pleasure with such breathless haste that they hurry past it.
- Soren Kierkegaard
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Second of all, it's not going to make any significant inroads into the population even if every harlequin baby survives. The number of non-harlequins reproducing greatly exceeds the number of harlequins who could potentially now reproduce. Not only that harlequinism in no way increases reproductive fitness so there's going to be no selective pressure towards them.
Conclusion, the "effect on evolution" is exactly zero.