Tzeadim › Pregnancy · First trimester

Exposures, travel & driving · Safety

No hot tubs, sauna, hamam or hot yoga

What it is

Raising your core temperature above ~39 °C, especially in the first trimester, is linked to neural-tube defects. Warm baths under 38 °C are fine.

every day · from week 4 · until week 42

Sources

• Physical activity and exercise during pregnancy and postpartum (CO 804) — ACOG · checked 02-09-2026

Last reviewed 01-09-2026 · Confidence: high

Compiled with AI assistance from the public sources listed above. Not yet reviewed by a clinician — check anything important against the source, with Tipat Halav or with your doctor.