Fetal pain perception is often modelled on the same neural structures as in the adult.
(1 The neural structures involved in pain processing in early development are unique and different from adults.
(2 Some of these structures and mechanisms are not maintained beyond specific developmental periods.
The immature pain system plays a signalling role during each stage of development, and fulfils this role using different neural resources available at specific developmental times.
Thus, the error here is reading the adult into the fetus.