ADJ-GRADED （尤指先天性的）畸形的，变形的，残缺的 If people or parts of their body are malformed, they do not have the shape or form that they are supposed to, especially when they have been like this since birth. （尤指先天性的）畸形的，变形的，残缺的 [formal]
...malformed babies.
畸形婴儿
More rarely, the tubes have been malformed from birth.