When I got my first White's, it was only an inch long. Very small. It was only a few months later before I noticed the "chirping." At first, I thought it was the parakeet in the room practicing a new sound, but after a couple weeks I found out it was the frog. So...I can't give you a better answer timewise, cause this was about a year and a half ago, but it was onlly a few months after I bought the inch long frog.