AbstractSeventeen children born to mothers with acute leukemia who received chemotherapy during pregnancy were examined for physical health, growth, and development. The hematologic and neurologic status and school performance were also evaluated. Chromosomal studies were done in the long‐term survivors ranging in age from 4 to 22 years. The children had thorough history and physical examinations to detect any abnormal symptoms or signs. The mothers' previous treatment was documented. In each child growth and development, school performance, intelligence testing, neurologic examination, and hematologic evaluation including bone marrow were normal. Bone marrow cytogenetic studies were also normal. Chemotherapy was given during the pregnancy in each case, including 11 cases during the first trimester. No fetal malformations were found and no late side effects could be demonstrated. The results of this study indicate that pregnancy is not a counterindication for treatment of patients with acute leukemia, and in the cases described here chemotherapy is not associated with excessive risk to the fetu