L1 learning question

When children learn a language like Spanish, which has multiple verb
paradigms, do they ever confuse the paradigms?  For example, do young
children sometimes produce forms like *habli', much as English-speaking
children sometimes say things like *speaked?  I realize that's not quite
the same, since that's a matter of irregular vs. regular (and the
contrast between the correct hable' and the incorrect habli' is
predictable based on verb class), but it's a related issue.  Also, if
they do, are -er and -ir endings more often confused than those and -ar,
since the -er and -ir have fewer differences, so are children more
likely to produce a form *podimos than *hablimos?

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