The other issue with slugs or unborn "in sac" babies is that the mother really should not be disturbed. Her lay box should be adequate with moss and substrate conducive to promote the passage of any live scrubs. A 24 to 48 hour period of extreme quietness and complete lack of disturbances is required. Even if there are retained products of conception this is needed. Inability to pass material can be problematic. There is a warm soak and massage therapy to help stimulate the passage. Only if the product, slug , binding in sac baby is close to the vent. Also its a very gentle massage to avoid any rupture or prolapse of the cloaca. Usually the female will pass the products as long as she is allowed to remain undisturbed for a period of time. A herp vet will have oxytocin that can induce a more steady contraction to aid in the passage.