A concentrated salt solution is injected into the amniotic fluid,killing the baby by acute salt poisoning. This technique is used after 16 weeks. It is no longer common in many Western countries because of its dangers to the mother, but pro-abortionists have exported this cheap technique for abortions to the majority world (developing countries) such as India.
It takes over an hour for the baby to die. After 24 hours, the mother goes into labour and delivers the dead child (although there are recorded cases of American babies, including singer Gianna Jessen,having survived the procedure).
Like animals, babies cannot tell us whether they are in pain. One indication of suffering is their reaction to what we would find painful.