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Different levels of expressed breast-milk feeding (
, 100 %; 
, >50–99 %; 
, >0–50 %; 
, 0 %) over the first 6 months of life, by study cohort (cohort 1, recruited 2006–2007; cohort 2, recruited 2011–2012), in mother–infant pairs from in-patient postnatal units of four public hospitals in Hong Kong. Sample sizes were as follows: 1 month, n 1584; 2 months, n 1249; 3 months, n 1027; 6 months, n 710
