Rashi on Exodus 23:26/רש"י על שמות כ״ג:כ״ו

1לא תהיה משכלה THERE SHALL NOTHING BE BEREAVED OF YOUNG, if you will act according to My will.

2משכלה BEREAVED OF YOUNG — A woman who miscarries or who buries her children at a very early age is called משכלה.