R help - Mar 2009 - I have a question about a programa in R

I am writing because I have a question with a program in R. I have?some
longitudinal data with repeated measures in different times, the individuals
are?infants who are measured the weight when they are born and through the time,
but I have different time and different? number of measures?with each infant
because the mothers does not were to all the controls in the hospital,?and?I
need to adjust a multilevel model but I have problems with the program in R.
?
Thank you so much for your answers to my question
?
I attach my file in R and the txt file.


      
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Hello,

And what is exactly your problem? 

Best regards,

Carlos J. Gil Bellosta
http://www.datanalytics.com