a mother who made the heartbreaking decision to give birth to her sick baby at just 20 weeks had her wedding dress redesigned so her tiny daughter could be buried in it .
annabelle was born weighing just 290 grams at canberra hospital after scans showed she had developed a serious form of spina bifida .
annabelle 's dress on the day she was born and ms cox dressed her so the family could spend time her .