I've raised several BRB litters. Neonates should run mid-70's low temp, mid 80's high temp. Humidity for a neonate is 90% or higher. Make sure the high temp is actually in the mid-80's; many people focus solely on the humidity and as a result of constantly spraying cold water into the baby tubs they don't get warm enough. I run all my babies on damp cypress mulch substrate with back heat so I don't have to constantly spray them; they can burrow and be plenty warm and humid.
Because BRB's run cooler than ball pythons and boa imperators their metabolisms are slower and they take a bit longer to digest a meal. If a feeder leaves a visible lump then don't handle the baby for at least three days. They are also fine eating on a 7-10 day schedule from the get-go, unlike ball pythons which you can feed on a 5-7 day schedule.