There is conflicting evidence on this point, while screentime certainly has negative implications for young children, the jury is still out on light-up toys. One study found that they tend to make young children less aware of the world around them. In contrast, another found them useful in promoting focus and developing a longer attention span. As long as they are paired with an attentive caretaker or sibling, the benefits of light-up musical toys appear to outweigh the potential for adverse effects.