I've heard from many that they take it as part of their confinement "diet". Like you've said, So Hup Pills (苏合丸) is believed to aid dispelling "post natal wind" from the body. Quite difficult to assess its effectiveness because most of them took this in addition to the other suggested herbs and confinement food. If you are considering confinement herb and soup packs, Eu Yan Sang has a 28-Day Essential Kit For New Mum - Postnatal Confinement Care package which will include the essential herbs and soups catered to helping a new mother recover: http://www.euyansang.com.sg/postnatal-confinement-kit-888842500036.html
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thanks