Motor development is a dynamic and continuous process in which motor skills present a gain and progression. It is influenced by the experiences to which the infant is exposed, such as the home environment. The infants' residence has gained prominence, as it is the first environment experienced, and when rich in affordances, it establishes a positive connection with motor development. Motor skills such as head control, reaching, grasping, and manipulating objects provide greater functionality and exploration so that the infant can develop.

To verify the influence of the available affordances in the home environment in the performance domain of typical infants' motor development.

This is a longitudinal study with two infants (one boy) born at term, evaluated in their homes from three to 10 months of age. The affordances availability was measured by Affordances in the Home Environment for Motor Development - Baby Scale (AHEMD-IS) questionnaire. It covers dimensions of the home environment such as physical space, variety of stimulation, and gross motor and fine motor toys, classifying them as less than adequate, moderately adequate, adequate, and excellent. The evaluation of the dependent variable, motor performance, was performed using the Infant Motor Profile (IMP). The analyzes were carried out in a descriptive, exploratory, and blind manner by two evaluators. The items analyzed in the performance domains were head control and manual reach, in the supine (items 1 and 14), prone (items 22 and 27), sitting (items 34 and 40), and sitting on the guardians' lap (item 66) postures.

Regarding the home environment affordances, infants maintained excellent and adequate classification in the gross motor skills and variety of stimulation domains during all months. The home physical space remained excellent for 50% of the infants, and for the other 50%, it changed from less than adequate to adequate in the 8th month. At this month, the infant achieved better scores in the motor performance domain. As the scores in the AHEMD-IS domains improved, the infants improved their motor skills. It was observed that adequate availability of fine motor toys at four months old allowed a score of 5 (item 66) in the IMP. While at five months old with excellent availability, a score of 6 (item 66) was obtained in the posture sitting on the caregiver's lap and supine position.

The present study presented the influence of the home environment affordances on motor performance at IMP. As the physical space of the residence and fine motor toy dimensions scores increased, there was an increase in the reaching, grasping, and manipulating objects scores and, consequently, in the total score of the performance domain.

The knowledge about how the influence of home environment affordances on the motor performance and motor skills of infants can be essential to guide clinical practice. In addition, this knowledge will allow health professionals to coach parents on how to stimulate motor development at home in a more assertive and individualized way.