Participants will receive 12 sessions of HEP therapy, once per week, 45 minutes each.

Participants will receive 12 sessions of traditional therapy, once per week, 45 minutes each.

This intervention is administered to the HEP Intervention arm.

The HEP approach, which includes intervention, is a child-centered, family-based early intervention approach based on the principles of enriched environment and plasticity, emphasizing the importance of homeostasis. It is based on theories that argue that development occurs as a result of the dynamic interaction between the environment, time, task, and individual (Ecological Theory, Dynamic Systems Theory, Perception-Action Theory, Neuronal Group Selection Theory, and the Person-Environment-Occupation Model). Hypotheses for intervention are generated based on a comprehensive assessment of these four fundamental factors (environment, time, task, and individual), and 10 core principles derived from environmental enrichment studies are applied with the guidance of ecological models.

The PDMS-2 is a scale used to identify motor developmental delays in children aged 0-6 and to determine motor skill levels and individual needs.

The PDMS-2 consists of two main sections: gross motor and fine motor, and 249 items. The gross motor section consists of reflexes, balance, locomotion, and object manipulation, while the fine motor section consists of comprehension and visual-motor integration. A score of 2 is given if the child's performance is within the desired level, 1 if it is similar to the desired level, and 0 if it is not.

To determine the risk and level of developmental delay, gross motor skills, fine motor skills, and general motor development are categorized as "very low, low, below average, average, above average, high, and very high," using age-appropriate normative ranges in the test manual.

Developed to assess sensory responsiveness, this test consists of five subsections and 24 items, and takes 20 minutes to administer. The test subsections include tactile deep pressure response, adaptive motor functions, visual-tactile integration, oculomotor control, and vestibular stimulus response.

This test is suitable for evaluating at-risk groups for sensory processing disorders, such as infants with developmental delays. Based on their score, the infant is assessed as normal, at-risk, or impaired in terms of sensory processing. A higher score indicates better sensory processing.

The Goal Attainment Scale (GAS) is the most commonly recommended goal-setting methodology for measuring change during and after intervention in clinical and research applications. The GAS, which assesses the child's achievement of individual goals established with parents at the beginning of the intervention, is a reliable tool for children with developmental challenges and provides subjective information about the child's needs.

The GAS has a rating scale of "-2" to "+2."