You mentioned that you’re 25 weeks along, but your doctor said that you’re measuring at 28 weeks, and you’re wondering what could cause this. And I’m assuming that what you’re referring to is the fundal height measurement, or the measurement that the doctor gets at each prenatal appointment when they measure from your pubic bone to the top of your uterus. And it should match your gestational age in centimeters, so at 25 weeks, you should be at about 25 centimeters. However, there are things that can affect this, like the way a woman carries a baby can affect it. Tall women tend to measure a little bit behind, because there’s more room for the baby to expand inside, and so they don’t go out as much. Shorter women may measure a couple weeks ahead, because there’s nowhere for the baby to go but out. So of course, the doctor takes these types of things into consideration. But if it’s a trend or if they feel like it’s concerning, then they may send the woman for an ultrasound.

One of the things they look at is the amount of amniotic fluid surrounding the baby. If there’s a lot of fluid, then the woman will measure ahead of her gestational age in centimeters when the doctor does the fundal height. Of course, it can also be the actual size of the baby. If the baby is actually measuring large, there are a few different factors the doctor will consider. Of course, one is genetics. If both parents were large when they were born and they’re large people now, then it’s very possible that they made a large baby together. Race and ethnicity can also contribute, but so can maternal factors, like maternal diabetes that is not well-controlled. Or if the mother is gaining excessive weight during the pregnancy, that can make her grow an extra large baby. So there’s lots of things the doctor would consider.

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Ultimately, I suggest talking with your doctor about it, and based on their knowledge of your circumstances, they’ll be able to give you tailored information and advice about whether or not it’s concerning, and if additional monitoring is warranted. If you have more questions for me in the future, feel free to ask them on our Facebook page at, and recommend us to your friends and family too.

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