GENESIS 38:13-18 (II KINGS 23:4-7)
If the mother had died because of the miscarriage, then the crime would be murder (of an adult), and the person responsible for the miscarriage that led to the woman's death would be put to death by divine law. But only for her death. Not her fetus'. A fetus was a non-person, as far as God and Moses were concerned.
LUKE 23:28,29 (Also in LUKE 21:23 -- MATTHEW 24:19)
And finally, a quote from the King James version. For the poetry:
JOSHUA 6:21, 10:28-40, 11:11-14
I SAMUEL 15:3, 22:19, 27:9-11
II KINGS 8:12, 15:16