For kids below 3 I would highly recommend Smigy - they have outlets at Novena, Orchard, Tiong Bahru and PLQ. Other indoor playgrounds have much bigger slides and ball pits which would also garner a bigger age group kind of kids. My kids started going to Smigy when they were around 7/8 months.
Don't really recommend bringing babies to indoor playground as the air ventilation there is not good with all the older kids running around in confined space. Just go to your neighbourhood public playground will do since he's still exploring standing and climbing
I feel like indoor pkayground theyll only start to enjoy maybe 16 months and up or so. I brought mine at 7 & 11 months he barely did anything
can try Kiztopia
smiggy