The Lancet Sep 10 2025 Existing approaches to parent-focused behavioral programs delivered up to 12 months of age which aim to combat childhood obesity are insufficient to improve body mass index (BMI) at approximately two years of age, according to the largest study to date on the topic published in  The Lancet . Globally, around 37 million children under five years live with overweight or obesity. Child obesity has major lifelong health impacts. To prevent obesity, many argue it is crucial to