I had to return to full time work when my youngest child was two years old. My son was three. I hired a maid and put the kids into a local pre-school in the morning. The maid picked them up, took them home for a nap and they played at home in the afternoon till I got home. It worked fine.
Lots of my colleagues have left their infants at home with helpers. (Another joy of being a foreigner in Singapore is that you are not entitled to the most basic local benefits like maternity leave - foreign women are only allowed 8 weeks in total). If you found someone who had worked with other children at that age, or maybe even had her own children, you'll probably be ok.
My first maid was a kindergarten teacher in Indonesia, and had a daughter of her own. She was fabulous, and I miss her still.
