Several reports say scientists are calling for parents to begin potty training earlier, arguing that disposable nappies harm the environment. The articles claim that shifting children from nappies to alternative methods sooner could reduce the overall use and disposal of nappies, thereby lowering environmental effects. The coverage is framed as a recommendation directed at parents, with the central rationale being sustainability. While the reports emphasize the environmental downside of nappies, they do not provide additional details in the provided excerpts about specific environmental metrics, study size, or the timeline being proposed for potty training. The information is presented as scientific advice or claims, though the excerpts do not name the researchers or institutions involved. Overall, the accounts converge on the same message: earlier potty training is suggested as a way to reduce environmental impact associated with nappies.