5-Month Fetus: Developmental Milestones and Terminology Note

At 5 months (~20 weeks) gestation, the fetus is in the uterus (not "womb"—a less precise term). Key metrics:

• Crown-to-rump length: ~10–12 inches (25–30 cm)
• Weight: ~1 pound (450–500 g)
• Head ~½ body length; facial features well-formed.
• Fetal movements (quickening) typically felt by mother 18–22 weeks.
• Skin covered in vernix caseosa; lanugo hair present.
• Hearing develops; responds to loud sounds.

This marks the halfway point of pregnancy; anatomy scan (18–22 weeks) assesses organ development.