If the gap is absent in babies, this suggests it is caused by environmental factors, which can presumably be fixed.

既然婴儿中不存在差别，那么，差别是由可以控制的后天环境因素所致。

youdao

If the gap is absent in babies, this suggests it is caused by environmental factors, which can presumably be fixed.

既然婴儿中不存在差别，那么，差别是由可以控制的后天环境因素所致。

youdao