I am 27 weeks pregnant and im in pain with my ribs and back the midwife tells me the baby feels large for my weeks and i measure 35 centermeters from ribs to lower navel do you think the baby is big?

Answer 1

Before 12 weeks the uterus normally sits too low to be felt protruding over the pubic bone.

Starting at 12 weeks, the top of the fundus is first felt at the top of the pubic bone, from 12 weeks on - a normal growth will be about 1 cm per week gestation, from the top of the pubic bone to the top of the fundus.

At 14 weeks the fundus will be 2cm (+12) past the pubic bone, for a total measurement of 14 cm so at 27 weeks, the measurement from the mothers' pubic bone to the top of the fundus should measure 15 cm (+12) for a total of 27 cm.

A fundus/uterus measuring large for dates may indicate your due date is off, a multiple pregnancy (twins), your baby is positioned high above your pelvis, which might be the case with a breech baby, or an abnormally high amount of amniotic fluid causing the uterus to be larger than expected.

if your uterus is growing more rapidly than it should. You may also have unusual abdominal discomfort, increased Back pain, shortness of breath, and swelling in your feet and ankles. If you have these symptoms, your midwife should send you for an ultrasound.

At 27 weeks your baby is between 14.5"/36 cm - head to toe and weighs 2 lbs /875 gm.

At 35 weeks your baby will be about 18"/47 cm and will weigh 5.5lbs /2.7Kg

A difference of 8 cm (8 weeks!) is too much to leave to chance, you need to get an explanation from your midwife on "large for dates" or decide if you could have miscalculated your LMP. Otherwise you may want to talk to your midwife about getting an ultrasound to determine why there is such a difference.

if you are not confident in the numbers your midwife is using you should see an Obstetrician and again request an ultrasound to determine if there is a miscalculation or if there is something going on...