do I need to contact HP about injury to my child due to exploding battery? or find a klawyer first?

Ms. Johnson, It is important that you keep the laptop, any documents related to the purchase of the laptop and any other items related to the laptop. It is critical that you take care of your daughter's medical needs and photograph what happened to her and to the laptop. You also should consult with an attorney as soon as possible. It would be better to have the advice and help of an attorney before you call the manufacturer.  The manufacturer may want to take your statement. An attorney can help you avoid problems when you give you statement. It is not unusual for a manufacturer or their insurance company to ask questions in a way that is designed to harm your claim. Defective product cases can be very complicated. You should contact an attorney as soon as you can.