ANDOVER, Mass. — Sitting on a pink blanket surrounded by baby toys and picture books, 17-month-old Hope Morrison watched one of her four older sisters dip a wand into a plastic container. Lianna, 10, blew the bubbles toward Hope, while Katelyn, 13, rubbed her baby sister’s head affectionately. Their mother, Cindy Morrison, watched as Hope followed the bubbles gleefully, smiling when one popped near her face. A few months ago, this family moment might have seemed unfathomable for Hope, an underdeveloped, emaciated baby living with end-stage liver failure in a Chinese orphanage.