How do male seahorses carry a pregnancy if females produce the eggs?

Answer: The female transfers eggs into the male's pouch, where the embryos develop

The female keeps the embryos and sends them food through the male — The embryos develop in the male's pouch, not inside the female. The pouch supports gas exchange and can provide additional nutrients, so the male is more than an external food delivery route.

The male first produces a second set of eggs inside his pouch — Male seahorses do not make a second batch of eggs in the pouch. The female supplies the eggs and their yolk; the male provides the chamber in which the resulting embryos develop.

The female transfers eggs into the male's pouch, where the embryos develop ✓ — The female places her eggs in the male's brood pouch, where they are fertilized and develop. The pouch supports oxygen exchange, waste removal, and nutrient provision. Male pregnancy concerns who carries and supports the embryos, not who makes the eggs.