In infants with hydrocephalus, the early signs of ventricular shunt malfunction are:

A tense fontanelle, vomiting, and irritability.

Explanation:

These are symptoms that are associated with an increase in intracranial pressure.

When a shunt malfunctions it is either partially or completely blocked causing it to function intermittently or not at all. When this blockage occurs the cerebrospinal fluid accumulates and can result in symptoms of untreated hydrocephalus and an increase in intracranial pressure

she forgets to repeat her message as often as necessary