Seriously, when DD was little, I used to take her out and about a lot, and the housework wouldn't get done nearly as often as it should, but it didn't matter as we weren't really making much mess. I used to have a list of jobs for each day and would usually get them done.
Three years later, I have a DS too (21m) DD is at preschool in the mornings, which limits our trips out because of school run, so more time is spent at home.
My house is a shithole. Aside from the mountains of toys and laundry, there are piles of stuff I hardly notice anymore, the hall and kitchen floors are nearly always muddy and the general grot is astonishing. I don't do these things, not because I am a slattern as I previously thought, but because I spend all my time just clearing up the chaos left by DS (mostly, DD contributes her fair share) this includes (but not limited to) shredded tissue or kitchen roll, wet sand from the outside sandpit being brought in by a bucket, half chewed bits of toast stuffed into furniture, all the sofa cushions and throws made into a trampoline, dried pasta emptied out of the cupboard, and the paper and pens/crayons/pencils that gets put away a minimum of 45 billion times a day. Not to mention the amount of washing caused by one small boy unable to stay away from any mud or water.
I used to actually do dusting FFS!