David Levy introduced the term "sibling rivalry" in 1941, claiming that for an older sibling "the aggressive response to the new baby is so typical that it is safe to say it is a common feature of family life."[7] Researchers today generally endorse this view, noting that parents can ameliorate this response by being vigilant to favoritism and by taking appropriate preventative steps.[8] In fact, say researchers, the ideal time to lay the groundwork for a lifetime of supportive relationships between siblings is during the months prior to the new baby's arrival.[9]