Is the baby pygmy marmoset smallest monkey in world?

The smallest monkey in the world is the pygmy marmoset(Cebuella pygmaea), also called the finger monkey or the pocket monkey, which is endemic to the rainforests of the western Amazon Basin in South America. Adults are only 13 to 15 cm (5.1 to 5.9 in) in body length, with a non-prehensile tail that is 17 to 23 cm (6.7 to 9.1 in) in length.