Yes, the fourth month (the start of the second trimester) is widely considered the "Golden Age" for travel during pregnancy. By week 14 to 16, most women find that the morning sickness and extreme fatigue of the first trimester have finally subsided, and the physical discomfort of the third trimester hasn't yet set in. Doctors generally approve of both domestic and international travel during this window, provided the pregnancy is "low-risk." If you are flying, the radiation levels at cruising altitude are not harmful to the fetus, but you should take precautions to stay hydrated and prevent blood clots (DVT) by wearing compression socks and walking the aisle every 30 minutes. In 2026, most airlines still allow you to fly without a "fit-to-fly" letter until at least week 28, but it's always smart to carry your prenatal records just in case. The primary travel concerns at 4 months are environmental: avoid areas with active outbreaks of Zika or Malaria, and ensure you have travel insurance that specifically covers pregnancy-related complications. As long as you listen to your body and don't overexert yourself, a "babymoon" at 4 months is a fantastic way to relax before the baby arrives.