§third trimester · week 33 of 40
you're 33 weeks pregnant.
last revised · baby is about 43.7 cm (17.2") · 1920 g (67.7 oz)
about the size of a pineapple.
Your baby's immune system is borrowing antibodies from you, building defenses for life outside.
this week's highlights
- Immune system loads up on antibodies
- Bones harden (skull stays soft)
- Lanugo mostly gone
- Lungs work in practice mode
how your baby looks
Cheeks rounder, body fuller. Skull bones remain soft and flexible to ease passage through the birth canal.
body in focus
- head
- Skull bones stay soft for birth.
- body
- Immune antibodies pass through the placenta.
- hands
- Hands and fingers move purposefully.
- feet
- Hiccup-like rhythmic kicks happen daily.
what's happening in your body
Belly is large and high. Heartburn, swelling, and back ache continue. The baby drops lower over the coming weeks.
gentle tips
- Talk through your birth plan with your support team.
- Pack hospital bag including snacks, phone charger, and slippers.
- Sleep propped up and on the left side.
- Eat dates daily in the last weeks — linked to easier labor.
- Track movement patterns daily.
what to expect next
Group B Strep test offered around weeks 35–37. Birth could happen anytime from week 37 (full term) to 42.