I think that each parent should listen to their gut instinct about what and/or how much to tell a young child when they ask the hard questions as this.
Some 7 yr olds are more mature than others. Sometimes they are happy with an honest, quick answer, some want to know more details.
I think that saying an abortion is the ending of a pregnancy is probably sufficient in this age group. It's short and to the point and it may be all the child needs or wants to know.
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sabby