*ORANG SPOILER*
'The arrival of a baby Sumatran orangutan leaves the keepers stumped in the opening episode. Sisters Emma & Subis are both pregnant and one morning Emma is found holding a baby. However, it turns out that she is still pregnant, and has taken on Subis' offspring. Sadly the baby died shortly before Kesuma was born.' That's the exact quote from the magazine - so I would imagine that Subis rejected her baby (probably knowing it has a health problem), then Emma cares for it until it dies. The mystery of the dates has been solved - two babies!