Malbim Ayelet HaShachar Klal 474
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ושם "בן" מציין הילד החי שכלו לו חדשיו, אבל שם "זכר" כולל אף הנפל (תזריע סימן ד)
Ayelet Hashachar, translated by Betzalel Avraham Feinstein, 2021
The noun בן (son) indicates that the fetus completed its months of gestation, while the nounזכר (male) includes even a stillborn.