They should do this in the UK. From observing the locals, the maternity grant (until yanked by the government) was used to buy designer gear for the mother, cigarettes and some expensive fashionable buggy for the baby (usually topped up by the baby's grandparents). Unfortunately essential stuff was forgotten. This solves those problems.
Same as Australia in most cases unfortunately.. They have now removed the "Baby Bonus".
Whilst there were some pretty high profile cases of misuse (especially when it was given as a lump sum payment when it was first introduced as pork barrelling measure to gain ground amongst "Howard's Battlers") I think your claim that it was misused in "most cases" only goes to show that you don't have kids.