[Avodah] Dirty diapers and brachos

[Michael Kopinsky]

The gemara in Sukkah 42b says that once a child reaches an age when he can
eat grain, "marchikin mitzo'aso umimei raglav."

I understand that qualitatively, there is a difference between the tzoah of
a baby and that of an adult. I have two metzius questions:

1) When does that change actually take place? Is it actually eating grains
that affects the change, or is it solid food in general?

2) Is there really a change in mei raglayim? I don't understand why there
should be a cutoff age for this, or why the cutoff age should be the same as
that of tzoah. (Unless my factual assumption is incorrect, and there is
indeed a qualitative difference that takes place at the same time as that of
tzoah.)

KT,
Michael
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