Long ton, also known as the imperial ton or weight ton, is the name for the unit called the  ton  in the avoirdupois or Imperial system of measurements standardised in the thirteenth century that is used in the United Kingdom and several other Commonwealth countries alongside the French metrication invented in 1799.
Animals of the bear family (including seven existing species of bears and one species of giant panda) usually have very low cub to mother weight ratio. This ratio of giant pandas is at the lowest 1:1,000 to 1:1,500. The newborn's weight only about 150g (0.33 pounds), which is approximately one thousandth of their mothers' weight. One month after birth, they will weigh 2kg (4.4 pounds), then reach 5-6kg two months later.
JaMichael Brown weighed a whopping 16lb 1oz at birth. Larger, healthier, more muscular babies were born as a result, pushing the current average birth weight to 7lb 8oz for boys and 7lb 4oz for girls â up 2oz and 1Â½oz respectively since 1970.