It's small wonder <2yo children born into this atmosphere would have underdeveloped receptive and expressive language skills. I doubt this will prove an accura

It's small wonder <2yo children born into this atmosphere would have underdeveloped receptive and expressive language skills. I doubt this will prove an accurate measurement of their general cognitive development over time. Once the children are exposed to unmasked people with the frequency that used to be considered normal, their skills in that area will probably catch up...assuming what was previously considered "normal" ever does return.