No, AML (acute myeloid leukemia) is not the most common childhood leukemia. The most common type of leukemia in children is ALL (acute lymphoblastic leukemia), which accounts for approximately 75% of all childhood leukemias. AML, on the other hand, accounts for only around 15-20% of all childhood leukemias.
AML is, however, the most common type of leukemia in adults, accounting for around 80% of all adult leukemias. It is typically diagnosed in adults over the age of 65 and is much less common in younger individuals. It is also more aggressive than ALL, and can be harder to treat due to the fact that it is usually diagnosed at a later stage.
Overall, while AML is the most common type of leukemia in adults, it is not the most common type of leukemia in children. ALL is the most common type of leukemia in children, while AML is much less common.