According to these viral posts, it appears that a Malay man has been going around Yishun, knocking hard on doors of Muslim families to ask if there are any children in the house.
The first such incident was reported on Nov 3 in Yishun. The Malay man had knocked on the unit of a Muslim family, and greeted the lady through the windows. After the lady returned his greeting, he immediately asked if there were any babies in the house. The lady said no and asked why. The man fled. The lady was shocked and frightened by the man's question. Her children were in the next room so he could not see them. While she was not sure of the man's motive, she was convinced that he had followed her and her children from the food court. He appeared at her window right after she got home and locked the door.
The second incident occurred in Woodlands. This time, the Malay man had knocked hard on the unit of a Muslim family. The husband of the lady who posted this account opened the door. The Malay man claimed that he was thirsty and asked for a glass of water. The lady replied that they had ran out of drinks and the man could get water from the 7-11 opposite the house. The Malay man then said, "It's okay. Do you have any children?" By then, the lady had freaked out as she recalled reading online that a man was going around, asking the same question. She was about to push the door closed, the man push the door open and say something nasty to the family. Thankfully, the lady managed to shut the door and lock it.
Both families have made a police report. According to the second lady, the suspect is a Malay male in his late 20s or early 30s. He was carrying a sling bag.