It depends on the age of the person who was not breastfed -
For a baby, touch of any kind (including skilled adjustment or massage) is the best medicine! Attention is also important. Other than that, whatever the mother can do to neutralize her own trauma, will immediately show on the baby. There is a reason why there was no breastfeeding. When that reason is addressed appropriately, lots of tension goes away in her and, automatically, in a baby. Absence of breastfeeding is not the cause, it's a consequence of something else, which needs to be looked at.
For an adult, the Birth Into Being Method workshops are an effective way to deal with this. he whole point of the Method is to efficiently help people heal the trauma they experienced during their formative period.