【正确答案】Learning Sympathy A big part of being human is feeling sympathy, / but how early on in our lives do we learn this. / Scientists find that babies respond to other people, / by crying when other babies cry. / However, babies can't distinguish between themselves and others / until they're eighteen to twenty months old. / Toddlers start to show concern for others around this time. / Kids also begin to do things like comforting other people. / And by the time they're three, / most children will try to protect a victim in a fight. /