Today Joan Grfflths introduces: Ann Whitaker on ' Keeping Your Child Amused in Bed'; Renee Palmer on ' Working in a Large Store'; Housewives' Exchange-tips and hints from housewives in the North; Woman's Hour ante-natal clinic-a woman doctor on ' How is the Baby Growing? '; and the current serial story, ' The House Under the Water,' by Francis Brett Young , read by Deryck Guyler