49 Are there any reasons why some babies are heavier at birth? There are many reasons for varying birth weight. Apart from the genetic factors, there are other reasons why some babies are born with higher birth weights. Everything that happens dur ing pregnancy affects the baby's weight at birth. If the mother had health issues, anemia, high blood pressure, kidney ailments, or did not gain adequate weight during pregnancy, the baby tends to have a lower birth weight. These infants are called small for date babies. If the mother had diabetes mellitus during pregnancy or gained a large amount of weight, the infant's birth weight tends to be higher. These are called as large for date babies. However, by the end of the first week, the weight stabilizes, and the baby begins to gain weight. By the 10th day after birth, the baby's birth weight is generally regained.
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