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Parental math talk is foundational to early math development, yet its moment-to-moment effects on children’s engagement remain unclear. Using time-lagged fixed-effects models, we analyzed naturalistic play sessions from 121 Chinese parents and their preschool children (M_age = 5.2 years; 50% girls). Increased parental math talk predicted more feedback—both positive and negative—but also led to reduced child engagement. Crucially, only negative, non–process-based feedback (e.g., unexplained or person-focused criticism) mediated this decline in engagement. These findings offer some of the first causal evidence linking math talk to disengagement via low-quality negative feedback. We highlight the need for greater attention to how feedback is delivered in early math interactions and caution against assuming that more math talk is always beneficial.