Is Scuba Diving Safe During Pregnancy?

Is scuba diving safe during pregnancy?

No. Major medical and dive-medicine bodies, including the American College of Obstetricians and Gynecologists (ACOG) and the Divers Alert Network (DAN), advise against scuba diving at any point in pregnancy, from the moment you know or suspect you're pregnant through delivery. This is one of the few pregnancy activities where the guidance is a flat "don't," not a "limit it." Surface swimming and snorkeling are generally considered safe; it's breathing compressed gas underwater at depth that's the problem.

Why it's risky, and why there's no "safe depth"

When you breathe compressed air at depth, your tissues absorb extra nitrogen that can form gas bubbles as you ascend and the pressure drops. An adult clears these bubbles through the lungs; the concern is that bubbles reaching the fetal side of the circulation may bypass that lung filter, and the baby has no way to exhale them. In decompression studies on pregnant sheep, used as a model because the fetus can be monitored through a dive, fetuses developed bubbles before the mother showed any sign of decompression sickness, meaning a dive that feels completely safe to you can still stress the fetus. Animal data link in-pregnancy diving and decompression stress to low birth weight, malformations, and pregnancy loss. That's why the guidance is zero dives, not a shallower depth: shallow dives, pool training dives, and "easy" resort dives all count, and no profile, even within standard no-decompression limits, has been shown safe for a fetus. Ethics rules prevent the controlled human studies needed to define a safe threshold, so the existing human data is reassuring but low-quality and can't rule out harm.

If you already dove, or feel unwell after a dive

If you dove before realizing you were pregnant, don't panic, but stop diving now and tell your OB or midwife so the timing relative to your stage can be noted, and loop them in before any dive-related travel so you can plan surface activities instead. Seek urgent care if you ever develop joint pain, a rash, dizziness, numbness, or breathing trouble after time in the water, which can signal decompression sickness and needs prompt evaluation.

Diving while breastfeeding

After birth, diving while breastfeeding is a separate and far more reassuring question. The nitrogen load and bubbles from a safe dive don't meaningfully pass into breast milk, and there's no evidence that diving harms a nursing infant through milk, so you do not need to "pump and dump" for diving itself. The item-specific cautions are about you, not the milk: postpone diving if you have an active breast infection or inflammation (mastitis), and avoid buoyancy-compensator chest straps cinched tight over engorged breasts, which can be painful and cause leaking. Wait until you're physically recovered and medically cleared, pump before a dive for comfort while you're away from the baby, and stay well hydrated, since dehydration both raises decompression-sickness risk and can affect your supply. When in doubt, ask your provider, who can confirm the right timing for your return to the water.