Superstition but best to listen to the elders. my mum told me not to nail a loose painting to the wall as the sound will affect the baby. however, my neighbours who just moved on next door drill and drill whole day. 😐so I asked my hubby to nail the painting while I am out to appease my in laws. sometimes, its best to create harmonious relationships with in laws for small matters like that, no matter how independent you are.