[ANSWERED] If the child says [l?lo ? ] for “yellow,” how could you determine whether this is an [l] for [j]…

If the child says [lɛlo
ʊ
] for
“yellow,” how could you determine whether this is an [l] for [j] substitution
or an assimilation process?
If a child said [tɛdəpo
ʊ
n] for
“telephone,” could this be an assimilation process? Explain.