Many Pro-life defenders say their thinking about the children, but if they were actually thinking about they kids they would support the right to an abortion. If a woman gets pregnant and doesn't want the baby, but has it anyway, then the child will be unwanted. The child would be a burden to the woman, therefore would not have a caring and loving childhood and upbringing. No child deserves that. On another hand, in cases of rape and incest it would also deal great damage to both the woman/girl having the baby and the baby itself. The child will always be that burden and reminder to them, therefore not getting a fulfilling upbringing. There have also been cases where the "mother" in question is a young girl, usually a case of rape. A child cannot take care of another child.
As for the "abortion takes a toll on your body" pro-lifers, pregnancy and labour is much worse. Many women have complications during pregnancy, sometimes needed abortions for medical reasons. There have been many cases of women needing an abortion in order to live.