Judaism allows abortion up until the point where the baby crowns *if and only if* the mother's life is in real and immediate danger.

That goes hand in hand with a sort of anti-martyrdom philosophy that extends to asking 'two of you are dying in a desert, and you have one sip of water left in your canteen - you, or the other guy?' and answering 'you, since you cannot prove that his life is more valuable than yours and *you* know that you'll go for more help if you survive.'

Apart from the danger thing, it's within the first 40 days (six weeks-ish).