I've found a few things are key as a new dad: a travel stroller, a stroller/car seat/bassinet system, and a rocker that works with all seats.

I'm sure I'll find more recommendations soon, but these are the three I've found key in the first 2 months of my kid's life.

Here are the links for products I mentioned:

Snoo: buy / rent

Doona: travel stroller / car seat system

Nuna: versatile stroller, carseat, bassinet