The foreman of the jury made clear that they had convicted Amanda Hutton on the basis that she was grossly negligent by not providing adequate nourishment for Hamzah.
Jurors returned their verdict to a packed court three after almost five hours of deliberations.
Hutton was remanded in custody and will be sentenced tomorrow by Judge Roger Thomas QC.
Following the conviction of Amanda Hutton, questions are raised over two little boys killed by those who were supposed to care for them.
A mother who starved her son to death threatened to kill her other children, a judge who sentenced her to 15 years in prison heard.
For two years the mummified body of four-year-old Hamzah Khan lay hidden in his mother's squalid house.