Two under two

Opinions please on two under two. My little one has just turned 5 months and I love the idea of a small age gap- however I am also very aware of the added stress another baby will cause. Opinions from people who have two under two and those who waited a little longer please. Anything that would need to be considered (buggy upgrades, car space with seats etc)) I’d want a 3 year gap max 😊