think twice before you file a law suit.
1) you can file a complaint in the hospital.
2) if you really want to sue, what's your damage? if there is no damage, no one will take your case because there is no money involved. No lawyer will take your case just to give the nurse a BIG warning, who will pay the lawyer to take this action?
As the CAT said, these medicine are pretty safe, even there are some overdose, it shouldn't do any damage to the baby.
I am a father and my second one is coming. As a parent, be prepared and read some book like 'How to be a new mom' or 'new mom book for dummies'. stay calm and reasonable, don't be panic. "在孩子生病的時候束手無策,在孩子吃錯藥不知所措的媽媽" is not a good mom.