This Fact Checks claim is that: Female Seahorses do not give birth, the males do.
In the article used to prove this claim it is stated that once the female seahorses eggs are matured they are then transferred to the males brood pouch where they are fertilized. At the end of the gestational period the male experiences strong muscular contractions that push 12-1000 fully formed baby seahorses into the water (National Ocean Service).
https://oceanservice.noaa.gov/facts/seahorse.html#:~:text=After%20completing%20an%20elaborate%20courtship,pouch%2C%20where%20they%20are%20fertilized.
After further research and analysis of similar articles this claim proves to be true. Although the female carried the egg for a period of time due to the male carrying and contracting these fully grown babies out, the male is the one officially giving birth. The National Ocean Service article used in this claim is a very credible source. The National Ocean Service is a federal agency that manages, protects, and observes the oceans and coasts. Information posted to this site is very credible.
Another credible source to back up this claim is the University of Sydney's research on this topic where they come to the same conclusion on this unique way seahorses give birth.
https://www.sydney.edu.au/news-opinion/news/2022/09/06/new-research-discovers-the-elaborate-and-unique-way-seahorse-fat.html
This claim proves to be true though it's credible source, information, and others I found through my research.