There are few things as sweet as giving a new little baby a bath. It's a great time to bond with your baby and have a few minutes to relax together without having to also be doing a million other things at once. No checking phones, or folding laundry, or picking up toys during this activity!
There are a bunch of different ways that you can bathe a baby, all of them work and can be adjusted to what is best for you, your home, and infant. It all depends on the space you have, how old your baby is, and what you feel comfortable doing.
I love a good, old-fashioned sink bath. Plop that baby into the kitchen sink and soap her up! If your baby is already sitting up, not much is needed in terms of equipment as long as your sink is large enough to accomodate her and you have a cover over the drain. If your infant is still quite small and needs to lay, something like this Puj Infant tub that you can place in your sink can be a super convenient way to bathe her. It's safe, dries fast, lays flat, and has magnets so you can just attach it to the fridge or a washer/drier for storage.
If you're planning on bathing your baby in the tub, there are a few different options for you. You can get a cushion similar to the sink one that is designed for the tub to help support her back and neck, or you can just roll a little towel under her head and fill the tub up about an inch. There are also BabyDam Inserts that can block half of the tub so you don't need to fill it all up and waste any water.
That being said, your baby definitely does not need any type of bathtub contraption once she is old enough to sit up. She is perfectly capable of sitting there as long as you are vigilant and aware of her movements so she doesn't slip in the water. Most babies love being in the water, and all they need are some cups to play with and maybe a special little rubber duck to splash around with!