He made his political debut in the 2006 general election when he joined a six-member PAP team contesting in Tanjong Pagar GRC, and they won by an uncontested walkover.

[3] Baey entered politics during the 2006 general election when he joined a six-member People's Action Party (PAP) team contesting in Tanjong Pagar GRC.

The PAP team won by an uncontested walkover and Baey thus became a Member of Parliament representing the Queenstown ward of Tanjong Pagar GRC.

[5] In February 2007, Baey was named as one of the members of a 'new media capabilities group' aimed at countering online criticisms of the PAP.

[6] During the 2011 general election, Baey switched to join the five-member PAP team contesting in Tampines GRC and they won with 57.22% of the vote against the National Solidarity Party.

[5] In December 2013, Baey, who is known for sharing his personal life on social media,[7] attracted controversy when he mentioned that he paid below the full price for a meal at a food stall in Tampines North.

After the stall owner clarified that he had given Baey an undisclosed discount out of goodwill, Baey publicised that the stall would offer a special discount for up to 100 customers a day from 21 to 22 December 2013, and would donate all proceeds to the Tampines North welfare fund to help needy residents.

[5] Baey retained his parliamentary seat in Tampines North during the 2020 general election after his five-member PAP team won with 66.41% of the vote against the National Solidarity Party.