Great insert, weird sizing
I purchased the Medium insert and have been using them with my LO since she was about 7lbs. They are narrow and fit quite well into both NB and OS shells of different brands (not just Best Bottom). She is close to 11lbs now, and I feel that her inserts feel quite wet after 2-3 hours, so I can't see them lasting until 22lbs without a booster. I do reach for these quite frequently due to the size and shape.
Reviewed by: (Verified Buyer) Amina from Toronto on 11/27/2018