Mrs. Parker-Myers, 35, a preschool teacher who lives in a two-bedroom apartment in Kensington with her husband, Lars, a manager of jewelry trade shows, is the writer of the group. She chronicled their two-week journey to China in an eloquent adoption diary that includes comment on everything from the sparrow kebabs and goat testicles that she encountered during her first days in Beijing to the mothers’ attempts to absorb the essence of the country that their daughters never knew.