CHENGDU, China -- A group of panda cubs all bred in the last year got some play time together early Monday.

Officials in China say the cubs were born between July and September and are being raised in two delivery rooms in Chengdu.

The oldest cub, Meng Meng, is four times heavier than the youngest one, Ya Yi.

All of the pandas are well past their fragile stage, but they won t open their eyes until about 100 days after birth.

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