Bibbity
"do hope this baby meets their expectations.
Having met a couple or three very earnest young parents, they can be quite discombobulated when their babies don't conform to their plans."
What an absolutely ridiculous statement. I do hope you didn't pull a muscle with that stretch.
It's not at all ridiculous.
It is perfectly true.

, no need for a list of do's and don'ts, just a simple message of what the plans are, preferably given verbally.