A washing basket full of clean, folded clothes can keep my girls occupied for hours

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We have a few small tubs of toys, and only one is out at a time, so when I rotate they will happily play with the 'new' toys for quite a while.
Big sisters are great entertainers!
A bowl and plastic ladle (each!! learnt that the hard way) are also very popular. Or a spoon and a little cup each.
Mostly though I get stuff done when they sleep!