Hong Kong celebrated the birth of its first two locally-born giant pandas on Thursday. Their mother, Ying Ying, set a record as the world’s oldest first-time panda mother. She gave birth to the twins at Ocean Park just a day before her 19th birthday, equivalent to 57 in human years. Ying Ying and her partner, Le Le, successfully mated naturally in March. So, here’s all you need to know about panda’s birth facts: A newborn panda cub weighs only 90-130 grams. At birth, a cub is about 1/900th the s