The CDC recently fine-tuned their growth charts, but the basic data is the same. Some of the data came from the Fels Research Institute study of children 0-2 years in Ohio many years ago. Some more came from the NHANES in the 1970s (National Health and Nutrition Examination Survey) -- the data for the 2-18 year growth charts. Some of each group were breastfed, some were bottle-fed. Those formula fed ate a variety of different types of formula, including homemade ones. None of the children raised on formulas since 1980 have had their growth made into growth charts. Most of these children, both Fels and NHANES began solids at 2-3 weeks of age, and most were drinking regular cows' milk before a year, regardless of whether they started out breast or bottle.