Assessment of Body Mass Index in Infancy: It Is Time to Revise Our Guidelines

Infancy, a time of substantial growth, is also a critical period for the development of obesity risk. Many studies have identified that rapid or excessive weight gain during infancy is associated with increased risk for childhood obesity,1 as well as later-life obesity and cardiometabolic dysregulation.2,3 Weight gain during infancy does not fully capture growth during this time, however, because the amount and pace of growth in length also have implications for infants' body proportionality, body composition,4 and obesity risk5 in early childhood.

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