At 33 weeks
At 33 weeks, your baby is about the size of a pineapple (ananas) and measures around 43.7 cm from head to heel (NHS). Their brain and nervous system are now fully developed, and their bones are hardening, apart from the skull bones, which stay soft. You may feel really tired and start to notice painless Braxton Hicks tightenings across your bump.
Your Baby at 33 Weeks
Your baby's brain and nervous system are now fully developed. Their bones are hardening, but the skull bones will stay soft and separated until they are around 12 to 18 months old, and this slight flexibility makes the journey down the birth canal a bit easier (NHS).
The lungs are maturing and producing surfactant, which will let your baby breathe by themselves after birth. They can suck and swallow, although these reflexes will not be properly coordinated for another week or so, and they are storing iron in their liver to use for about six months after they are born (Pregnancy, Birth and Baby).
You will probably know your baby's pattern of movements by now. Many babies are very active at certain times, often at night when you are trying to sleep, and still while you move around during the day (Pregnancy, Birth and Baby).
Your Body This Week
Your uterus may start preparing for birth with Braxton Hicks contractions, a tightening over your bump for 20 to 30 seconds before the muscles relax again. They should not hurt. A heavy feeling pressing on your pelvis can be a sign that your baby is in the head-down position, ready for birth (NHS).
Late-pregnancy discomforts tend to build now, including leg cramps, backache, heartburn and swelling of your feet and legs. The weight of your baby can also bring piles, frequent peeing or small leaks of urine, so daily pelvic floor exercises are worthwhile for strengthening these muscles and improving bladder and bowel control (Pregnancy, Birth and Baby).
When to call your midwife or doctor: Contact your doctor or midwife straight away if swelling suddenly gets much worse, is there first thing in the morning, or affects your face or hands, and call your midwife or hospital if tightenings become painful or regular. A sudden change in your baby's movements, or movements stopping, also needs a call immediately.
Garbh Sanskar This Week
A small daily practice for this stage, from Mamta’s 1:1 sessions. It is tradition and gentle self-care, not medical advice, so keep every check-up and follow your doctor or midwife first.
- Mantra: The Gayatri mantra (Rig Veda 3.62.10) meditates on the radiance of Savitr and asks that our minds and insight be stirred; chant it softly for a few minutes, or simply listen to a recording. Family traditions differ on who chants it, so follow what feels right in your home, and find the full text in our Garbh Sanskar mantras guide.
- Music: Research on fetal hearing found that by around 33 to 35 weeks, babies respond to higher-pitched sounds as well as low ones, so your baby may now react to a wider range of sounds. Pick a calm bhajan or song you love, keep it at a comfortable volume, and listen because it soothes you rather than to change your baby.
- Gentle movement: Mamta suggests a gentle seated breathing practice this week: sit upright on a chair or cushion, breathe in through the nose and let a slightly longer, easy breath out, never holding your breath, only with your doctor's or midwife's clearance. Follow it with your daily pelvic floor squeezes.
- Food: Traditionally, week 33 sits in about the eighth month of Charaka's regimen, when a warm milk and rice gruel (kshira yavagu) with ghee is the suggested food. A small bowl can sit within a balanced vegetarian diet, alongside the iron, calcium and folic acid your doctor recommends.
- Garbh samvad (a line to say to your baby): I know your busy times and your quiet times now. I am right here with you.
Questions About Week 33
What do Braxton Hicks contractions feel like at 33 weeks?
They feel like a tightening over your bump that lasts 20 to 30 seconds before the muscles relax, and they should not hurt. If they become painful or start coming at regular intervals, contact your midwife or hospital in case you are going into labour.
Should I pack my hospital bag at 33 weeks?
The NHS suggests packing now in case your baby arrives early, since only 1 in 20 babies arrive on their due date. Include your birth plan and hospital notes, something loose to wear in labour, nightclothes, nursing bras and breast pads, super absorbent sanitary pads, baby clothes and nappies, healthy snacks and any medicines.
Is my baby's brain fully developed at 33 weeks?
Both the NHS and Pregnancy, Birth and Baby say your baby's brain and nervous system are now fully developed. The skull bones, however, stay soft and separated until around 12 to 18 months of age, which helps during birth.
Practise With Mamta, Wherever You Are
Mamta guides expecting mothers through private 1:1 Garbh Sanskar sessions online, scheduled in your own time zone, from the first trimester to the last week. Start with a free conversation on WhatsApp or read how sessions work.
Sources
Mamta is not a doctor. Medical points on this page come from the sources below, checked in October 2026. Sizes are approximate and babies vary; your scan report is what matters.