Seahorse Frequently Asked Questions / How tiny are seahorses when they are born?

Seahorses are very small when they are born. It varies from species to species, but all of them are tiny. The smallest we know of are around 4 mm (about 1/64 of an inch), born to Pygmy Seahorses, and the largest is 1.8cm (just under 3/4″), born to Pot Belly Seahorses. We also don’t know the size of the babies from the absolutely smallest pygmy seahorses, so the babies could be even smaller!

Baby seahorse by adults tail.

Newborn brazilian seahorse by the tails of the mom (middle) and dad (background). The baby is approximately 7mm.

Posted in: Reproduction