It's not prohibited in Singapore to feed stray animals in Singapore’s neighbourhood estates, such as cats. However, in recent years, it's possible to see posters put up by Town Councils discouraging residents not to feed stray cats. It's alright for you to be compassionate and feed the stray cats unless littering is involved.
Kind-hearted residents may not be that considerate at the same time. Recently, it has been commonly spotted that residents have been feeding the stray cats. However, the residents did not clean up the mess that was left behind. Uneaten cat food was left behind under the void decks and corridors, which caused a mess and hindrance for the residents.
The litter left behind might attract pests like rats and cockroaches which might affect the health of the residents living near the area. Authorities are not informed by the mess yet, but if the situation continues, there would be a outbreak of illness. So be a compassionate and responsible resident, feed the stray cats and clean up the mess left behind.