- **Lanugo Hair:**  
  - The fine, soft hair covering the fetus is called lanugo.

- **Protection:**  
  - Lanugo helps hold vernix caseosa (the protective, creamy substance on the skin) in place, which shields the delicate fetal skin from amniotic fluid.

- **Temperature Regulation:**  
  - It provides a layer of insulation, aiding in temperature regulation while the baby develops in the womb.

- **Developmental Role:**  
  - Lanugo is a normal part of fetal development and typically sheds before or shortly after birth.