The aim of the study is the examining responsiveness of the Object Permanence Scale. The sample of the study will be 7-16 months old babies with motor developmental delay. Inclusion criteria: 7-16 months of age, sitting for at least 3 seconds but not being able to switch independently between sitting and other positions, and showing at least one developmental delay in the motor development subscale of the Bayley III Developmental Assessment. Evaluations will be done at baseline and 3 months. Exclusion criteria: Medical complications (eg, severe visual impairment) limiting participation in assessments; autism, down syndrome, or spinal cord injury; diagnosed uncontrolled seizure disorder; or a neurodegenerative disorder.

Inclusion Criteria:

• 7-16 months,
• Sitting for at least 3 seconds but unable to independently switch between sitting and other positions
• To show at least one retardation in motor subscale of Bayley III.

Exclusion Criteria:

• Medical complications (eg, severe visual impairment) limiting participation in assessments; autism, down syndrome, or spinal cord injury; diagnosed uncontrolled seizure disorder; or a neurodegenerative disorder

Infants aged 7-16 months with motor developmental delay