Inherited Condition. 1 / 20, 000- 60, 000 newborns are born w/ this condition which can cause malformations of heart, lungs, kidneys, gut & genitalia. Affected babies often have small head size, fused second & third toes &sometimes extra fingers and toes. There can be learning and behavior problems from mild to approaching autism in severity. Infants may grow more slowly, have weaker muscle tone, & have feeding issues.