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What is a normal rate of weight gain in infancy?

We have retrieved weights from the Child Health records of an annual cohort of 3418 full‐term children, aged 18–30 months in order to define a lower limit of normality for weight gain for both clinical and research purposes. There was a strong tendency for children at the extremes of the distribution to move inwards towards the average: only 26% of those below the 3rd centile for weight at six weeks were still below it at one year. We describe a method based on conditional standards to correct for this “regression to the mean” and produce a measure of the discrepancy between a child's predicted and actual growth: the “thrive index”. The value of the thrive index below which only a minority of children fell provided a lower threshold for normality. While most children below the 3rd centile for weight at 9–24 months of age also had subnormal weight gain, 41 % of those with subnormal weight gain had not fallen below the 3rd centile.