Related milestonesMakes different kinds of sounds to express feelingsBy 6 MonthsNot StartedUses babbling to get attentionBy 6 MonthsNot StartedListens and responds when spoken toBy 6 MonthsNot StartedReacts to sudden noises or soundsBy 6 MonthsNot StartedNotices toys that make soundsBy 4 MonthsNot Started