Your Baby Never Breathes In The Womb — So How Does It Survive?#BabyDevelopment #PregnancyFacts

Added: 2026-05-22

[00:00:00]Inside the womb, a baby survives without breathing air, powered by one of nature's most brilliant systems. A baby's lungs are completely filled with fluid, collapsed and inactive. They don't need air yet. The placenta acts as the lungs, pulling oxygen directly from the mother's blood and passing it to the baby. Oxygen rich blood races through the umbilical cord straight to the baby's heart every single second. The fetal heart has a special opening, the foromin oval, that sends blood around the lungs entirely. A bypass channel called the ductus arteriosis diverts blood away from the lungs straight to the organs that need it. Incredibly, babies do practice breathing movements in the womb, training their diaphragm using amniotic fluid. From week 24, the lungs produce surfactant, a coating that stops the airways from collapsing at the first breath. At birth, one breath changes everything. The lungs expand, the bypasses close, and the baby's system switches on instantly. From placenta to first breath, the human body builds a whole breathing system before it ever uses it. Nature is extraordinary. Follow for more.