As a subject matter expert in fetal development and obstetrics, I can provide a detailed explanation on the question of where urine goes from a baby in the womb.

The process of waste elimination for a developing fetus is quite intricate and different from that of a newborn or an adult. The fetus lives in a unique environment within the womb, and its waste management is facilitated through a symbiotic relationship with the mother.

**Urine Production and Elimination in the Womb:**


1. Formation of Urine: The fetus begins to produce urine as early as the 12th week of gestation. This urine is formed in the kidneys and consists of waste products that need to be eliminated from the body.


2. Swallowed Amniotic Fluid: The fetus swallows the amniotic fluid in which it is floating. This fluid is composed of water, electrolytes, nutrients, and yes, fetal urine. The fetus swallows approximately 450 to 500 milliliters of amniotic fluid per day by the third trimester.


3. Amniotic Fluid Volume Regulation: The balance of amniotic fluid is maintained by a dynamic equilibrium. The fetus produces urine, which contributes to the amniotic fluid, and the mother's body helps regulate this volume through the process of osmoregulation.


4. Maternal Role: The mother plays a crucial role in this process. The amniotic fluid, which includes the fetal urine, is eventually absorbed by the placenta and processed by the mother's kidneys and liver. The waste products are then eliminated from the mother's body through her urine and feces.


5. Fetal Waste and Meconium: While the fetus does not typically pass stool in the womb, it does produce a small amount of waste known as meconium. Meconium is a thick, sticky substance that is composed of materials like dead cells, hair, and other waste products. It is usually not passed until after birth, but in some cases, it can be excreted into the amniotic fluid if the fetus experiences stress.


6. Fetal Health and Monitoring: The health of the fetus is closely monitored by medical professionals, particularly in terms of amniotic fluid levels and the presence of meconium. Abnormalities in these areas can indicate potential health risks and may require medical intervention.

7.
Birth and Beyond: After birth, the baby's first bowel movement typically involves passing meconium. This is a normal part of the transition from the womb to the outside world. The baby's digestive system continues to mature, and regular bowel movements begin as the baby starts to process food.

In summary, the elimination of waste products, including urine, from a baby in the womb is a complex process that involves the fetus, the amniotic fluid, the placenta, and the mother's body. It is a well-coordinated system that ensures the health and well-being of the developing baby.

read more >>

Babies generally do not poop in the womb, given that their digestive systems are not used to process much outside of this swallowed urine. They do accumulate a small amount of fetal poop known as meconium that consists of dead cells, waste, etc, that is pooped out within the first few days of life.read more >>