Handbook pg 239
"Testimony meetings are not held in Primary. However,
children who give talks may bear testimony as they desire.
Primary leaders and teachers should provide opportunities for children to learn what a testimony is and why people bear their testimonies.
Leaders and teachers should testify as they teach and sing. Children should be encouraged to express their understanding of and feelings about the members of the Godhead, prophets of God, and principles of the gospel. They should understand that when they do this, they are bearing testimony."