I've heard of this and was recently handed some paperwork by DD's kindy on development of 2yr & 3yr olds and there is a calculation but says to do it from 3yrs:

"Adult height can be predicted from measurements of height at 3yrs of age; males are approximately 53% of their adult height, females 57%."

My DD is 96cm tall at 28mths old!!!! Doubling it would make her 192cm tall!!!