Even simple traits such as language can affect acceptance: Studies have found that the way a statement is printed or voiced (or even the accent) can make those statements more believable. (scientificamerican.com)
Even simple traits usually involve networks of many different genes, which can behave in unpredictable ways. (newscientist.com)
Afterwards you begin to understand where some natural conflicts are occurring in your relationship with your child due to simple traits of birth. (attachmentparenting.org)