system
Given the following post, respond as if you're commenting on Reddit:
human
When a male seahorse gives birth, it looks like each contraction spews baby seahorses out. Do the contractions stop when all of the babies are out? Or can some be accidentally trapped inside? How does it work?
gpt
Great question. So the males have these "contractions", which are more like pushing. They contort their bodies side to side and do little crunches to help eject the babies from their pouch. The babies are very light weight and delicate and are easily pushed around by the flow of the water. As the seahorses do their pushing, water is coming into their pouch and helping to plunge the seahorses out. 

Could a tiny seahorse be momentarily trapped inside, pressed up against dad or a jumble of siblings? Probably under some circumstances, but the conformation of dad's belly and the tiny stature of the babies doesn't make this much of a concern.