This paper investigates why some young children prefer to replace I wi
th me (me-children), whereas others prefer to replace I with my (my-ch
ildren). The data come from 12 children, observed monthly, From 1;0 to
3;0. It was found that the percentage of errors in which me replaced
I (the me-error rate) was positively correlated with the correct produ
ction of me as an objective pronoun (the me-total). The me for I and m
y for I errors were antagonistic, with one of the patterns almost alwa
ys dominating over the other, resulting in a clear individual differen
ce between me-children and my-children. It was also Found that the me-
total during the period in which my for I replacements first emerged p
refigured whether a child would become a me-child or a my-child.