My children got used to the trumpet while still in the womb. Shortly after my daughter was born she was being fed by nurse and on the radio a trumpet tune was played. According to the nurse my daughter stopped feeding and opened her eyes. After the music stopped she started feeding again. At home, she would sleep right through my practicing (in the same room) because she was used to the trumpet. All that aside, a practice mute should allow you more opportunities to practice, and as Dr. Mark has pointed out, playing softly without the mute can be very beneficial.