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Week 32: Baby practices breathing. Thirty-two weeks into your pregnancy, or 30 weeks after conception, your baby's toenails are visible. Although your baby's lungs aren't fully formed, he or she practices breathing. Your baby's body begins absorbing vital minerals, such as iron and calcium from the intestinal tract.
Somewhere between the 24th and 28th week of the pregnancy, surfactant -- sometimes called lung detergent -- starts being produced in the amniotic fluid. As the pregnancy continues, more surfactant is produced. That is why the closer to term, 38 to 40 weeks, the better a baby is able to breathe outside the womb. Surfactant coats the inside of the lungs and keeps the alveoli, or air sacs, open. Without enough surfactant the lungs collapse. This can cause a condition called RDS, Respiratory Distress Syndrome. It is rare, but it can happen to a full term baby as well. Other causes of RDS are infections, congenital conditions and meconium aspiration (when the baby breathes meconium, the first stool, into their lungs).