If it's a baby you'll have been there for approx .0005 of a second ''waa, waa, waa'' doesn't matter if they were fast asleep when you went in there. They know.
For a toddler - *bang* *bang* *bang* (either on the door or ANYWHERE in the house. Plus, 'mum, mum, mum, mummy, mummy, MUMmy, MUMMY, MUM,MUM, MUM, MUM''
That's why you should spend your non sleeping baby free days on the toilet
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