Chinese calendar dates back 5,000 years and uses lunar and solar cycles. Emperor Huang Di created sexagesimal cycle in 2697. Chinese calendar has 12 months and 354-355 days. Predicts baby's sex with 90% reliability from conception
Amniocentesis checks for genetic conditions like Down's and Edwards' syndromes. Test involves removing cells from amniotic fluid surrounding baby. Offered only when higher chance of genetic condition. Not mandatory, decision rests with patient
Amniocentesis removes amniotic fluid and cells for testing or treatment. Used for genetic testing, fetal infection diagnosis, and treatment of polyhydramnios. Genetic testing typically performed between weeks 14-20 of pregnancy
Amniotic fluid is protective liquid contained in amniotic sac. Initially contains water with electrolytes, later includes proteins and ECM components. Volume increases from 25 to 400 ml between 10th and 20th weeks. Reaches plateau of 800 ml by 28 weeks, then declines to 400 ml at 42 weeks
Amniocentesis is used for prenatal genetic diagnosis and fetal assessment. Procedure involves inserting needle into abdomen to sample amniotic fluid. Typically performed between 15th and 20th week of gestation. Gold standard after 15 weeks gestation for genetic disorders