Purposes of this qualitative study were to clarify the cognizance and emotion of parents when they knew that their child was trisomy 18, the bitter and supportive experiences for parents while their child was in hospital, and what parental expectations were for medical care. Subject population was 41 members(58.6%) made up of 70 parent(s) who had a child with trisomy 18. The cognizance of parents when they knew that their child wa trisomy 18 were: chromosome abnormality, disability, and short-lived. The responses of parents after they knew about their child were: self-reproach and to deny themselves, isolation and observing their peers, and groping for their way of life as parents. Bitter experinces while their child was in the hospital were: seeing the pitiful sight of their child, feeling incomplete as parents, facing up to the reality of their child's disability and death, poor and imperfect medical service, hopeful look of other children and mothers, looks and comments from their surroundings, life without a husband, and nobody talks about their experience. Supportive experiences for parents during their child's hospital stay were: child's living life to the full, release from isolation and sharing experiences, being a parent for their child, positive and kind aspects of their surroundings, affectionate care, and the patient's siblings. Parents were impatient for medical care to describe not only the worst possibility, but also, any hopeful possibilities. Additionally, parents needed care and follow-up after talking about their child's severe condition.