<prompt> To define still bih, period is specified from -20th week of gestation to 1 week after bih28th week of gestation to 1 week after bih20th week of gestation to bih28th week of gestation to bih  <response>: Death of a foetus weighing 1000g at bih this is equivalent to 28weeks of gestation. REF. PARKS TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICAL 21ST EDITION. PAGE NO - 519 