I agree that bringing life into the world is morally bad. I also agree that eating other animals is morally bad, as is killing, always. However, that does not mean we should not do these things at times. You just need to understand that you are still committing an immoral act for personal gain. There is no such thing as a perfectly moral existence, as the world is a cruel place which cares little about morality and often forces you to be immoral. You should instead work towards being as moral as in out can when you can, and accept that sometimes morality is out of your hands.

In the case of the child: you are bringing a human consciousness kicking and screaming into this world you know to be dangerous and cruel. That is immoral, and you did it either by failing precaution, or out of personal want or instinct. I think to repent, you are morally obligated to give that child a good life at minimum and ideally the best life you can. You are beholden to them until they can live on their own happily, and you are obligated to help them even after that. I also think that if that child resents how you've cared for them, you have no grounds to hold that against them, as you were the one that forced them into this world.

If you cannot do the above, you are should reconsider whether you are fit to have a child.

It is also arguable that to do justice without injustice, the only option is to adopt or guide another person who has no one providing things they need, and I don't think this kindness should be limited to children but children are the most vulnerable.