I couldn't get pockets to contain bf poo until around 5 months when ds had bulked up a bit and even then they didn't reliably contain poo until he was eating good amounts of solids at 10 months.
We started using cloth at around 2-3 weeks old and used little lambs mainly with small rikki wraps as well as some size bimbles ( bumbles are huge I think! ) and motherease xs sandies and never had a leak!
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