It’s how developed your baby’s lungs are. Docs don’t test for fetal lung maturity in every pregnancy — just the ones they believe they might want to deliver early because of mom’s or baby’s health. For example, maybe baby will need surgery after the birth, and we want to make sure all the doctors she’ll need will be there. Or maybe, because the mother has diabetes that’s poorly controlled, the baby will need to be delivered early, and docs will want to get an idea of how well her lungs will be able to function.
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