First trimester
Week 12 of Pregnancy
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About the size of a plum
2.1 in · 5.4 cm · 0.5 oz · 14 g (crown to rump)
Your baby this week
- Reflexes arrive — fingers open and close, and toes curl.
- Kidneys begin making urine, which becomes part of the amniotic fluid.
- The intestines, which grew quickly in the umbilical cord, move fully into the abdomen.
What you may be feeling
- Nausea fading for most
- Brief dizzy spells as blood volume rises
- Renewed energy
Gentle tips for this week
- The nuchal translucency (NT) scan window is weeks 11-14 — confirm timing with your provider.
- Stand up slowly to limit dizziness.
Common question for week 12
What is the NT scan?
The nuchal translucency ultrasound, done between 11 and 14 weeks, measures fluid at the back of the baby's neck. Combined with blood work it estimates the chance of certain chromosomal conditions.
Every pregnancy is different. Sizes are averages, symptoms vary widely, and none of this replaces the guidance of your own provider.