Babies start to hear sounds around 16 weeks of pregnancy. By 24 weeks, research has shown babies turning their heads in response to voices and noises. The clearest voice they hear is mom’s voice, of course, because it reverberates through her body. Other voices are more muffled because they have to travel through the uterus to be heard, but they’re still heard. So go ahead and talk, sing and read to your baby bump, especially in the 3rd trimester. It’s a great way to bond with your unborn baby and stimulate their hearing at the same time. Dad can do it too!