This is the baby version of the standard Australian proof coin set for the year. It contains the circulating denominations from $2 down to 5 cents, but all of them are in "baby" versions - special designs exclusive to the baby sets (Brilliant Uncirculated and proof) on which the definitive design has been re-done as children's toys.
The Mint says about it:
"Everyone is having fun as Australia’s iconic circulating coins are reimagined in an adorable baby theme. The bright eyed and giggling baby is surrounded by a gang of mates including the adorable wooden echidna, the winky-wonky lyrebird, the wet windup platypus and the cute and cuddly plush emu and roo. Altogether, they create a unique and engaging year set that celebrates the arrival of a new baby, the wonders of a child’s imagination and the simple joys of collecting."