I've taken a good look around at the products others recommend for use in Singaporean taxis, and it looks like the harness-based ones are the best (of the worst) for a 2.5 year-old? (Is this right?) I've still not worked out a good solution for a 6 month-old -- it appears to be either a capsule pram or (worst case) in a sling or harness on Mum.
I was wondering if anyone knew of Singapore suppliers of the harnesses, e.g. Joey Safe, Tote 'n Go, Ride Safer?
Recommendations for what to do when travelling in a taxi with a 6 month-old also appreciated!