If your baby is measuring large
A weaker basis for intervention than it is usually treated as.
A suspected large baby frequently leads to a discussion about induction or cesarean. Two things are worth knowing before that conversation.
First, the estimate is imprecise, and it is least precise for the biggest babies, which is exactly where the decision is being made. Second, in a review of 41 studies and 112,034 patients, an estimated weight above 4,000 grams predicted shoulder dystocia poorly, correctly flagging only 22% of the cases that actually occurred.
The question that reframes it"What is the margin of error on this estimate, and would the recommendation change if the true weight were 400 grams lower?" The detailed evidence on this, including how many cesareans would be needed to prevent one permanent nerve injury, is in Part 2.
Where this comes from:
270. Moraitis AA, Shreeve N, Sovio U, Brocklehurst P, Heazell AEP, Thornton JG, et al. Universal third-trimester ultrasonic screening using fetal macrosomia in the prediction of adverse perinatal outcome: a systematic review and meta-analysis of diagnostic test accuracy. PLoS Med. 2020;17(10):e1003190.
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This page is educational. It supports the conversation with your own clinicians. It is not consent to any treatment, and it cannot assess you. If you are worried about a symptom now, see urgent warning signs.