Sorry for your loss.its so hard loosing A scale baby, as other have said some snake are born with defect that just show up out the blue
Small pinkies for a 5 month old boa seem a bit small, they normally start off on large pinkies/small fluffs depending on your boa size.
My little baby boas are now 5months I've bred my self are now on small mice and some a medium mouse wouldn't be A problem

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