This week in baby growth news... The network of nerves in baby M's ears is better developed and more sensitive than before. She may now be able to hear both my voice and those around me as we chat with each other. She's inhaling and exhaling small amounts of amniotic fluid, which is essential for the development of her lungs. These so-called breathing movements are also good practice for when she's born and takes that first gulp of air. And she's continuing to put on baby fat. She now weighs about a pound and two-thirds and measures 14 inches (an English hothouse cucumber) from head to heel.