Wall Street Journal -- Natus Medical Inc. (BABY) registered to sell up to $150 million worth of common stock, which would boost its current market value by roughly 36% if fully exercised. The company, which makes medical screening and monitoring devices used in newborn care, disclosed the plans in a shelf registration, which means the share sales may be offered from time to time or not at all. It didn’t specify what it would use proceeds for, except to say they’d go to general corporate purposes, which could include acquisitions.