Final answer:
Epilepsy is a neurological disorder that causes difficulties with speech and seizures, leading to a loss of the ability to talk and understand speech.
Step-by-step explanation:
The condition that shows up during childhood, causing difficulties with speech and seizures, is epilepsy. Epilepsy is a neurological disorder characterized by recurrent seizures, which are periods of abnormal electrical activity in the brain. This condition can cause the loss of the ability to talk and understand speech, along with other symptoms such as seizures, impaired motor function, and cognitive difficulties.