The rapid rise of smartphone use has revolutionized communication and lifestyle patterns worldwide. While smartphones provide numerous benefits, their excessive use by parents during critical periods of child development has raised significant concerns. Increasing evidence suggests that parental smartphone use may negatively affect parent-child interactions, emotional bonding, language acquisition, social development, and behavioral outcomes in children. From a nursing perspective, understanding these implications is essential to support families, promote healthy technology use, and safeguard child well-being. This article reviews the impact of parental smartphone use on child development with emphasis on cognitive, emotional, social, and behavioral domains. It also highlights the role of nurses in counseling parents, advocating digital balance, and integrating education on responsible smartphone use into health promotion strategies. Evidence-based recommendations for practice, policy, and future research are discussed to strengthen nursing interventions in addressing this emerging public health concern.