Adeline,
from what I gather from sengkang forum, the PCF is a childcare (not playgroup/kindergarten), so can start any age. for me, my MIL looks after my kids, so they only need to go 3 hr nursery.
for little steps under PCF, it is available under Punggol South Branch at Hougang. But it is abit far to walk over.
I haven't decided whether mei will start school at 8am or 9am next year cos brother attends K2 at 8am. mb start same time, she will feel better. but a little too early to wake up at 7am. if start at 9am, my MIL can pick both up together at 12 noon. still have 1 year to consider...