Bumgenius AIO sizing

Hi,

I'm looking at getting some of the bumgenius all in ones, my LO is 19lbs (on 2nd snaps in BG BTP) and I'm wondering if to get the large or the mediums.

Can someone advise me?

Thanks

I would get large. Mine is 20lb and large fits fine. No leaks. I am selling some large only 2 weeks old if interested.