A three-week-old Gosport baby, was rushed to QA Hospital last Tuesday, sadly passed away yesterday.
The parents, described as in the mid-20's and from Forton Road, were arrested on Monday on suspicion of attempted murder but have since been bailed until September.
Detectives are examining the property trying to work out how the child sustained the injury. It is understood they will now be re-questioned by officers investigating the case.
Friends of the couple have taken to social media to maintain the couples innocence in what they have described as "an horrific and tragic accident".