I’ve read this, and the answer states we can omit relative clause heads when the verb that follows them is a present participle
Can we really say:
“The baby sleeping is Mike’s son”
instead of saying:
“The baby who is sleeping is Mike’s son.”?
I think it’s more common to say “the sleeping baby”. I would use the second one if you add more modifiers: e.g. “The baby sleeping in the couch is Mike’s son”.