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The squat test is inexpensive and less time-consuming, and therefore particularly suitable for clinicians. There is a need for appropriate tests to identify developmental delays early in life. This study investigates the Test of Infant Motor Performance (TIMP) unidimensional model and its ability to explain variance in items response, hierarchic order of the items, levels of difficulty, and the extent to which the items were appropriate to distinguish different levels of function for infants in Brazil. Six hundred fifty-five infants were assessed. Families