Researchers looked at data from 647,957 sets of babies and parents born in Norway, linking parents’ birth-weight data with that of their children.
The condition is associated with birth complications such as shoulder dystocia, in which the shoulders get stuck during vaginal delivery, and can lead to maternal hemorrhages after birth. Though high maternal birth weight, maternal obesity, diabetes and carrying a baby past term are associated with the condition, until now it has been unclear whether both parents’ birth weight affects the weight of their offspring.
If both parents had high birth weights, they had an 8.06 percent higher risk of macrosomia. The risk was also raised by 3.84 percent in cases where only the mother had a high birth weight and 2.34 percent in cases in which only the father had a high birth weight. Just 3.6 percent of the babies born to parents without high birth weight were large at birth, compared with 23.4 percent of those babies born to parents who did have high birth weights.Maternal obesity was also linked to a higher birth weight, even in mothers who did not themselves have macrosomia in infancy.
Overall, the researchers write, “parental macrosomia tends to be passed between generations,” though it is unclear to what extent genetics or habits play a role. More research is needed to determine whether screening for past macrosomia could identify high-risk deliveries, and the researchers point out that because their research used Norwegian data, it is not necessarily applicable to other populations.to the Centers for Disease Control and Prevention, 7.
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