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It is very important that the blood sugar be kept within the normal limits. If her
blood sugar remains high, the babies will be getting too much
sugar, which will cause them to gain weight too quickly, and that increases the risk of premature labor. And just because a baby is big, doesn't mean that they're ready to be born. They need time for their lungs to develop, etc.
Also, if the babies are exposed to high sugar, their pancreas starts working faster to produce more insulin.