Hi Drey mummy,
You can go to MCYS website to print out a list of infant cares. It's about 7 pages long for full day infant care centres. Serangoon is pretty big. If you happen to be at the area nearer to Hougang, there're a lot of centres there.
I've not tried Cherie Hearts or MyFirstSkool. My son is at Agape Little Uni. I like them. They're good.