Amniotic fluid never becomes stagnant. Some is reabsorbed through the amnion and umbilical cord. Some of the fluid is absorbed through the foetus' intestines into his bloodstream. It will then pass into the mother's placenta and be excreted by her kidneys. By taking fluid into his lungs, the foetus will also use the muscles he'll need for breathing.
Pregnancy demands extra nutrient needs.
The more restrictive the diet, the more challenging it will be to meet these nutritional demands. Food areas of special attention include proteins. Animal based foods are high in protein, and to achieve the same amino acid mix, plant foods must be matched or complemented. Finally, vitamin B12, which is only found in animal based foods, will also need to be supplemented. Babies who cry all the time distress not only themselves, but also their parents.