A pregnant male Dwarf H. zosterae seahorse like any male seahorse gives birth to babies about 3 weeks after eggs are deposited into the brood pouch by a female.

This is what a male Dwarf Seahorse (Hippocampus zosterae) looks like when it's pregnant, and Sorin calls this his pregnant papa Dwarf Seahorse picture.
Photo by Sorin Damian
Interesting Seahorse Fact: The
Hippocampus zosterae or Dwarf species seahorse grows to less than 2 inches in height. Because this seahorse is so small, when baby dwarf seahorses are born they are very tiny, like not much larger than the size of a pin head, and you have to look really close to see them.
While they are tenatious in their pursuit of food, Seahorses are not aggressive feeders, doing best in a tank with slower moving fish such as the Mandarin Dragonet. Slow swimming Seahorses also do not fare well in aquariums with more than a very light current. The DIY Seahorse Tank which is taller, rather than wider, was specifically designed to house a Seahorse or two and a Mandarin Dragonet.
Thinking about adding a Seahorse to your tank? See the Saltwater Aquarium Fish Compatibility Chart first.