Mother was 29 and father was 32 years old at the time of conception. Child with rare trisomy was fifth of six pregnancies (gravida, 6; para, 5). One male sibling was also diagnosed with partial trisomy 18q and lived for nine hours. Additionally, mother had a miscarriage at seven weeks four days during a subsequent pregnancy due to an unknown cause. Parents suspected a monosomy condition. A sibling was born this summer.