Here's what we can say:
* Tiny: Some monkey babies are incredibly small at birth, like the pygmy marmoset, which is only about the size of a bumblebee!
* Larger: Other monkeys, like the mandrill, are significantly bigger at birth, measuring around 10 inches tall.
So, it all depends on the species!
To get a more accurate answer, you'd need to specify which type of monkey you're interested in.