Boo now weighs a little over 500 grams and measures about 29 centimetres from crown to heel (that's almost a full ruler). His hearing is well established and he can make out a distorted version of my voice, the beating of my heart and my stomach rumblings (these happen often!). Loud noises often heard in utero, such as the barking of a dog (Baldric!) or the roar of a vacuum cleaner, probably won't bother Boo when he hears them outside the womb. Numerous studies seem to indicate that the unborn prefer classical music, especially Vivaldi. In addition to advances in Boo's hearing, his lungs are developing to prepare for breathing. He can now swallow.
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