A: Life begins at conception. From that point on the embryo is a person and has the same moral status as a child.

B: What do you think of diseases that kill small children?

A: They're horrible and we must eliminate them.

B: The children?

A: The diseases!

B: Sorry! What do you think of embryos that die between conception and birth? [1]

A: Because of abortions?

B: No, because they just die on their own.

A: Natural embryo loss and miscarrages? They're just things that happen. It can be very sad for the parents, but it's not a moral issue like abortion.

B: What about animal suffering?

A: Animal suffering counts just like human suffering, and we should minimize it. Factoring farming is horrible. If you keep a cat you shouldn't let it outside because cats kill birds. Consider giving up meat.

B: What about suffering of animals in nature? [2]

A: Again, that's just something that happens. It's not a moral issue.

Update 2013-02-08: I agree with B.

[1] The Scourge: Moral Implications of Natural Embryo Loss (Toby Ord, 2008)

[2] The Importance of Wild-Animal Suffering (Brian Tomasik, 2009)