No, its not that simple. His opinion has been formed by his own personal experiences. After having his mother give birth to a sibling under risky circumstances he has developed a misguided view that every woman is capable of giving birth when this simply isn't the case. He should ask himself how he would feel about abortion if he had lost not just his sibling but if his Mother had also died because of the fact that her doctor refused to allow a partial-birth abortion to be performed?
Those are the circumstances where a partial-birth abortion is performed by the way; No woman who considers abortion is going to wait that long to have one performed and I'm sure that few doctors will agree to perform one without a reason where the infant's quality of life is in question due to deformities or the Mother could possibly die.
Nothing is ever that simple, not even birth.
Consider the case of rape; suppose a little girl is raped and finds herself pregnant as a result. However, her body is too underdeveloped to reliably handle the strain of giving birth. Could you force that girl-child to carry her pregnancy to term for any justification knowing that a child would all but ruin her young life and possibly end it? Now, suppose she does carry it to term and it is found as she goes into labor that she will indeed die if she attempts to pass the the fetus through her womb. If you were her doctor, would you make the choice to conduct a partial birth abortion to save her life? or would you wait until the last second while they both die?
These are just the most extreme scenarios that I have outlined, like I've already stated, nothing is ever so simple that you can apply a narrow-minded solution that over-steps the bounds of reason and reality.