I started Medina on books very very early, so that is something I would recommend. We are a trilingual pair but Medina is growing up
bilingual at the moment, which can delay speech.
Holding out is a good thing, that's something I would recommend. My husband's nephew starting speaking at around 3, before that we (my husband and I) couldn't understand much of what he said, he spoke in his own language and then one day, he starting talking.