If you are worried about the dust, don't stay in the same room or stay out while they install the grilles.
Don't need to believe in superstitions. Anyway as a new mum you will be too busy with the baby to install it after birth. Imagine having to bring the baby out during grille installation, do thorough cleaning ensuring he/she don't accidentally touch & ingest the dust, and then also having to care for him/her.. don't forget you also have to BF/pump on a schedule..
It's just easier to settle before the baby is here
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