We have a lot better experience with our boa mothers by waiting a while before removing the young and cleaning up the cage.
If they have enough privacy Boa constrictor babies tend to like to lay quiet for a while, get breathing well and orient themselves to their surroundings. Boa moms watch over them during this period, many times tongueing and nudging each one, perhaps in an effort to make them move or burst their birth sacks.
For whatever reason, if they are allowed to go through this ritual and the babies left alone until they begin to disperse on their own there seems to be less stress and conflict. We have had mom and babies rest together for over a day before beginning to scatter. It looks like a big mess but they all come out clean with their umbilicals dropped and no exposed yolks.
Of course you have to watch for big moms who are restless after giving birth, they might hurt the babies. Boas kept on newsprint or some other featureless substrate cannot prepare a nest for the babies and may be more defensive and restless. Take these out on a hook and put them in an opaque container, like a trash-can. That calms them down. pour a bucket of tepid water over them before putting them back in their cage. It removes the smell of the recent birth.
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Gus
A. Rentfro
RioBravoReptiles.com
"Quality is not an accident. Perfectly healthy animals are a minimum requirement.. everything else is just salesmanship" gus