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Noticing requires more than experience since it involves identifying key moments in teaching and interpreting them through knowledge-based reasoning. However, little is known about how early-career teachers notice content-specific issues. This study examines what 207 early-career teachers in the U.S. noticed in authentic video clips of mathematics instruction and how their content knowledge and educational backgrounds shaped their noticing. Findings show that teachers most often noticed issues related to mathematics pedagogy and commonly took an interpretive stance. Their interpretations were closely tied to strong content understanding, while indicators of educational preparation, such as the teacher preparation route or holding a mathematics teaching credential, were not significantly related.