Feeding Cat's - Leaf size/Younger-Older

[tartandtiny]

In a prior post, (I cannot locate it now) Mona Miller stated the following:

"I feed young caterpillars tender leaves and older caterpillars older leaves. Don't give older instars 3-5 young leaves. Don't give 1st to 2nd, older leaves"

I just found 3 1st instars, each on their own leaf. The leaves are size of my hand. Should I just let them be and continue to munch away until the leaf needs to be replaced or should I transfer them to smaller/younger leaves?

[Mona Miller]

I'd let them eat the leaf they are on. Usually, younger instar find it easier to eat tender leaves and usually their mother will choose that kind of leaf. Older larvae can get runny stools if the leaves are to tender.