Short answer (Jain view): Abortion is generally considered himsā (harm) because it ends a nascent life that has begun, so it is avoided. The core Jain principle of ahimsa prompts seeking the least harm and protecting life from conception onward. In very rare, extreme situations (for example, when the mother’s life is at serious risk), some authorities discuss careful consideration of options, but there is no universal rule, and the emphasis remains on preserving life and minimizing harm. There may be minor differences in emphasis between Digambara and Śvetāmbara traditions, but the shared principle is to avoid intentional killing and to act with caution about karmic consequences. You can read more here