Luscombe and Owens1 propose a new formula (weight(kg) = 3(age)+7) for accurately estimating weight in the 21st century child. They point out that in most cases the classical formula (weight(kg) = 2(age+4)) underestimates actual weight and that this has implications for potential underdosing of resuscitation drugs and fluids. One of the factors implicated by the authors in this increase in weight is the rising …