Background: The phenomenon of sharenting has led to an increase in children's digital presence on social media platforms, particularly Instagram. This study aimed to examine the relationship between features of mothers' Instagram use and their sharing of photos related to their children. Methods: The present study was conducted with 130 mothers of children who applied to our university hospital and who had an Instagram account and allowed us to follow them. The mothers completed an online questionnaire that consisted of parents' sociodemographic data and data regarding social media use characteristics. We created a new Instagram account for this study, and we examined the mothers' Instagrams via this account. The number of Instagram followers was analyzed by dividing it into four equal 25% percentiles. Results: The present study found that mothers with more followers shared more photos about themselves and their children on Instagram per year (p < 0.001). It was confirmed that mothers with more followers were more likely to share their children's photos showing them alone, showing them playing, photos that included identity information, and photos that violated their privacy (p values respectively; p = 0.004, p = 0.001, p = 0.043, p = 0.015). Conclusions: This study highlights the association between mothers' Instagram follower numbers and the presence of risky posts about their children on social media. The number of Instagram followers might serve as a predictor of sharenting behavior. The study's findings are discussed thoroughly, and recommendations are provided for future research and practice in this area.