Travelling with a baby is entirely doable — it's just that spontaneity now requires planning. The good news: babies are surprisingly portable, don't complain about the itinerary, and travel free or nearly free on most transport.
The trick is that the kit matters less than a handful of safety basics: the same safer-sleep rules apply on holiday as at home, sun protection is non-negotiable, and the car seat rules travel with you. Get those right and everything else is just logistics and snacks.
Start with a day trip or a night away before attempting anything with a boarding pass. It's a gentle dress rehearsal, and you'll find out what you actually use versus what you heroically carried around all day.