Okay fine, but is there evidence that other caretakers can’t form similar bonds that birth mothers might form by age 3 or whatever? Many children grow up in ado

Okay fine, but is there evidence that other caretakers can’t form similar bonds that birth mothers might form by age 3 or whatever? Many children grow up in adoptive houses, or are largely taken care of by someone other than their birth mother, and go on to have entirely normal productive lives. The poster I was responding to seemed to be making a more expansive claim but it was hard to really tell, so I was trying to figure out exactly what he meant.