11 months, myoclonic jerks, sometimes sequential, since age 6 months

The mother has videos of these myoclonic jerks, which have no remarkable features. They occur while the infant is engaged in activities such as eating or sitting quietly, but not in sleep. 

The following pages demonstrate the EEG during wakefulness:

The  EEG during wakefulness is normal for age. 

The following pages demonstrate the EEG during sleep:

The EEG is normal during sleep. The apiculate waves represent vertex waves.

The infant is developmentally normal.

Bottom line?

1. Vertex waves may be remarkably sharp, especially in little children.

2. Their association with slower waves often results in a "spike-and-wave" morphology.

3. The history and the normal EEG during wakefulness and sleep strongly predict the diagnosis of Benign Myoclonus of Early Infancy

The spectrum of benign myoclonus of early infancy: Clinical and neurophysiologic features in 102 patients - PubMed