...to take said rod and beat the person in question to a pulp with it?
Co-sleeping with my 9-week old - 'You're making a rod for your own back, he'll be sleeping with you until he's 23'
Carrying Velcro baby around with me all the time - ' You're making a rod for your own back, you'll never be able to put him down'
Picking up my baby when he cries - 'You're making a rod for your own back, he'll learn that he can get attention just by crying'
Feeding him on demand - 'You're making a rod for your own back, he'll never want to eat at normal times'
And so on, and so forth.
AIBU, AIBPFB?
And what is 'a rod for one's own back'? Where is that from? Who has a rod up their back?