Start with paperwork: your passport, KITAS or visa card, insurance card or letter of guarantee, and your prenatal record or maternal health book. Bring photocopies of everything, since Indonesian hospitals often want copies on file even when they also scan the originals. A printed birth plan helps if the medical team on duty that night speaks limited English. Keep this folder together rather than mixed into your general bag, because once you're home you'll need several of the same documents for registering a baby's birth in Bali.
For yourself, pack loose, front-opening clothing for after delivery, a robe, flip-flops for the bathroom, a phone charger with a long cord, and snacks and water for whoever is supporting you, since labor can run long and hospital cafes keep limited hours. Toiletries, a hair tie, and your own pillow make a plain room feel less clinical. Private hospitals in the tourist areas tend to be well stocked, but smaller clinics may expect you to bring more of the basics yourself, so ask your clinic directly what they supply versus what you should pack.
For the baby, bring a few newborn diapers, a soft going-home outfit, a swaddle or receiving blanket, and a car seat if you're driving straight home, since not every hospital lends one out. Costs and included supplies vary a lot between a public health center, a mid-size clinic, and a private hospital, which is worth factoring in early when you map out what families should budget for when relocating to Bali. Every hospital and clinic has its own list of what it provides versus what parents bring, so confirm the specifics with your doctor or midwife well before your due date.
This is general information, not medical advice. For anything specific to your child, please consult a doctor or a travel-health clinic.
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