Is it normal for a young girl to lay on her stomach and use her fingers and humps them?

It's common for young children to explore their bodies and engage in various forms of play as they learn about themselves. Laying on their stomach and using their fingers in this way can be a form of self-soothing or comfort. However, if you have concerns about specific behaviors or if they seem unusual, it may be helpful to consult a pediatrician or child psychologist for guidance.