§first trimester · week 12 of 40
you're 12 weeks pregnant.
last revised · baby is about 5.4 cm (2.1") · 14 g (0.49 oz)
about the size of a passionfruit.
End of the first trimester. Reflexes are kicking in — if you poke your belly, the baby will squirm in response.
this week's highlights
- End of first trimester
- Reflexes develop
- Vocal cords form
- Bone marrow makes white blood cells
how your baby looks
Fully formed in miniature — all organs are in place, fingers and toes have nails forming, and the face has eyes, ears, and a nose.
body in focus
- head
- Vocal cords are forming.
- body
- Bone marrow starts producing white blood cells.
- hands
- Reflexes work — fingers can curl into a fist.
- feet
- Reflexes work — toes can curl.
what's happening in your body
Your uterus has grown out of the pelvis and you may feel it just above the pubic bone. Many people see nausea fade this week.
gentle tips
- Eat enough calcium daily — your baby's bones are mineralizing.
- Consider sharing the news now that the first trimester is ending.
- Pelvic floor exercises (Kegels) help prepare for later pregnancy.
- Plan a healthcare check-in for the 12-week visit if not done.
- Apply sunscreen — your skin is more sun-sensitive now.
what to expect next
Welcome to the second trimester — the easiest stretch for most. Energy lifts, nausea fades, and the belly starts showing.