Features：
1. Model consist of female pelvis and two fetal heads
2. Two fetal heads are interchangeable, one is term fetus, one is premature
3. Clear detectable sutura cranii, anterior fontanel and posterior fontanel
4. Fetal head can be installed on the flexible rod and demonstrate passing through pelvis
5. Direct observation of relationship between fetus and pelvis
6. Demonstration of delivery process: engagement, descending, flexion, internal rotation, delivery etc..
7. Demonstration of use of obstetric forceps and vacuum extraction