It depends on the species. My experience with P. standingi is that the babies will eat 1/4" size crickets within the first 5 days or so. I offer fruit baby food to them every day as well, but they only seem to eat it when I put it on my finger and they lick it off. Unless they are eating it and I can't tell b/c their tongues are so little.
Don't know if this will help or not.
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Lisa
1.0.0 P.m. grandis (Linus)
4.3.0 P. standingi (Toby & Kona and their 5 babies)

