Ash was 5kg born so probably not the best to go by buy we LOVED CT and BBH from the start, we used longies/mother ease rikki covers/BBH pul covers and had great success. I used flanny flats for about 2 weeks before I chucked that in because Ash was just weeing SO much!
I also used BG OS with great success They fit Ash great!
Oh and small bubblebubs