Week 3 development of Ethan

Your baby loves listening to the sound of human voices now, especially
high-pitched ones. You're probably using singsong baby talk to
communicate with her without even thinking about it — watch how she
turns her head in your direction when you coo over her. Soft music and
the sounds of a musical toy will also keep her engaged, but steer clear
of raucous parties. Too much noise will either cause her to tune out
sounds all together or start wailing.