Ay nako, mama, a 4-day-old baby with fever needs to see a doctor or go to the hospital right now, ito ay serious talaga at hindi dapat palampasin. Newborns na ganito kalaki ang need ng immediate medical check para ma-rule out ang mga concerning things. Please don't wait, go na po ngayon to the nearest hospital or clinic, okay? Mama's Choice products and general home advice won't help dito, baby needs proper medical evaluation from a pediatrician ASAP. Sending you strength, and please update us once makausap mo na ang doctor.