I bought a Bumbo chair based on a passing comment someone made and I have no idea how anyone could ever live without one. Especially as Weasel only sat up at nearly 7 months old, this proved invaluable.
It really doubled as a second highchair for us, one that easily fit into our suitcases for holidays (it’s super light and hollow underneath so you can fill it with babygrows when packing it), into the back of the car or, even on occasion, jammed under our pram. If anyone ever sails with an infant, this is the one thing you should take with you. Also doubles as a helmet for drunk husbands.