When the mother becomes pregnant again , her bond with her previous offspring is permanently severed .
Gradually , it spends more time away from its mother , and at 12 months it is fully weaned , weighing around 2.5 kg ( 5.5 lb ) .
When the mother becomes pregnant again , mother 's bond with her previous offspring is permanently severed .
Gradually , it spends more time away from its mother , and at 12 months it is fully weaned , weighing around 2.5 kg ( 5.5 lb ) .