In Malaya, Williams found a very different health care problem: The mortality of newborn infants was extremely high. She became incensed after learning that companies were employing women dressed as nurses to go to tenement houses and convince new mothers that
sweetened condensed milk was a preferable replacement for
their own milk. This practice was illegal in England and Europe, but
Nestlé was exporting the milk to Malaysia and advertising it as "ideal for delicate infants". In 1939 Williams was invited to address the Singapore Rotary Club, the chairman of which was also the president of
Nestlé, and gave a speech titled "Milk and Murder," famously saying: :
"Misguided propaganda on infant feeding should be punished as the most miserable form of sedition; these deaths should be regarded as murder." Williams oversaw the development and running of a primary health care center in the province of
Trengganu in northeastern Malaya, and was responsible for 23 other doctors and some 300,000 patients. In 1941 the Japanese invaded, and Williams was forced to trek to Singapore to safety. Shortly after her arrival, Singapore too fell to the Japanese, and she was interned first at the Sime Road camp, and then later taken to
Changi Prison with 6,000 other prisoners. She was jailed for three-and-a-half years at Changi, and became one of the camp leaders, a position that led to her being removed for six months to the Kempe Tai headquarters where she was tortured, starved and kept in cages with dying men. Williams suffered
dysentery,
beriberi (which left her feet numb for the rest of her life) and when the war was declared over in 1945, she was in the hospital, near death. On her return to England, Williams wrote a report titled
Nutritional conditions among women and children in internment in the civilian camp, noting that: :''"20 babies were born, 20 babies were breastfed, 20 babies survived, you can't do better than that".'' ==Later years==