There are no official guidelines to assist in answering this question. I will search for relevant research papers instead.
From the Research
Evaluation of Hyperactivity in Infants
To evaluate an infant with hyperactivity, the following points should be considered:
- Hyperactivity is one of the core symptoms of attention deficit hyperactivity disorder (ADHD) 1
- Objective assessments of hyperactivity, such as acceleration-sensitive devices (e.g., Actigraph) and motion tracking systems (e.g., QbTest), can be used to measure hyperactivity 1
- The assessment setting (i.e., research laboratory, school, or home) can influence the presence and severity of hyperactivity 1
- Diagnosis of ADHD in preschool children is controversial due to the presence of normative behaviors during this period 2
- Early identification of ADHD is important to improve long-term outcomes, and clinicians should evaluate not only the mental condition of the child but also the family burden 3, 4
Assessment Techniques
The following assessment techniques can be used to evaluate hyperactivity in infants:
- Actigraph and QbTest have good discriminant validity, convergent validity, and sensitivity to the effects of stimulants 1
- Neuropsychological testing may be valuable for both diagnosis and the assessment of treatment response 4
- Objective measures of gross motor movement (hyperactivity) can be obtained using actigraphy 5
Considerations
The following considerations should be taken into account when evaluating an infant with hyperactivity:
- Comorbid psychiatric disorders and other developmental disorders should be considered in the differential diagnosis 4
- Family functioning is highly affected by the child's ADHD and should be addressed by physicians 4
- Hyperactivity in ADHD may be evoked by demands on specific executive functions or cognitive demands in general 5