The police are appealing for information on the whereabouts of Ms Chee Hui Ying, 26.
Ms Chee was last seen at Blk 537 Choa Chu Kang Street 51 last Tuesday (June 20), at about 6.30pm.
She had been wearing a red t-shirt and black slippers.
Her husband of nine years has no idea why she disappeared, according to Lianhe Wanbao.
The couple have three children: Two daughters aged eight and five, and a two-year-old son.
Her husband had gathered a search party comprising almost 40 friends, to comb Choa Chu Kang for about five hours, but to no avail.
Anyone with information can call the police hotline at 1800-2550000, or submit the information online at www.police.gov.sg/iWitness.
All information will be strictly confidential.