Leave the mattress alone, because they can't live on anything else. They depend on a host for survival. Good hygiene always helps to prevent and to not get reinfestation. He refuses to take a bottle or a cup from anyone, and if I leave the house, he constantly cries for hours on end. Most babies like the breast.
Some babies are hard to wean from the breast.
If the mother really wants to wean the baby, there is only one way. Just stop breastfeeding the baby. This is a power struggle. If the temperature does not come down, call the doctor to see what he suggests. Most temperatures will come down in two to three hours with acetaminophen or ibuprofen products.