This is an example of fitting a "growth model" to data. For an example that uses PROC NLIN, see "Fit a growth curve in SAS."
The article uses a different model, but the PROC NLIN syntax should be almost the same for your model.
However, in order to fit the data, the data should be in "long form." So your first step is to put the data into a data set that looks like this:
data Growth;
input ID Time Height;
datalines;
1 1 2.12
1 2 4.8
1 3 7.4
1 4 9.1
...ETC...
1 11 16.5
2 1 2.95
2 2 5.5
...ETC...
;
... View more