do these get more absorbent with washing? my (small) nature baby stuffable leaked with one small insert so the next time I put 2 in - baby woke in the night after 2.5-3 hours and her babygro was wet (not damp, wet). Maybe DH didn't put it on properly or maybe the insert was sticking out the hole a bit? They are second hand nappies but some of my inserts are new, wonder if they get better with washing like bamboo does?