The zoo in the capital now has a fifth member of its primate pack, with the birth of newborn on Friday 26 September to mum Sheli and dad Jamal.
The youngster will be named in the coming weeks, once the sex has been determined.
Baby L’Hoest’s monkeys are born with orange fur and generally cling to their mothers for the first few months of their life.
As such the baby will only be sexed and named by zookeepers once it has reached a certain level of maturity.
They are classified as Vulnerable on the IUCN Red List, mainly due to habitat loss from agriculture and logging, as well as hunting for bushmeat.
Visitors hoping to see the baby alongside the rest of the troop can save money on tickets when they book online edinburghzoo.org.uk/tickets.