UPDATED Friday, March 19, 2010 --- 1:30 p.m.
By NBC15's Zac Schultz

Madison Police are still investigating the death of a 4-and-a-half month old baby girl from late last week.

According to a search warrant filed in Dane County Court, Madison Police have gathered DNA samples from the girl's mother in connection to a possible charge of physical abuse of a child.

Last Friday morning, the girl's mother found the baby did not have a pulse and was not breathing.

An autopsy revealed the child had a number of injuries, including multiple rib fractures, bruises and older fractures in each of the baby's forearms.

A doctor says the injuries ranged from five hours old to 10 days old.

According to the search warrant, the mother told police she was using methadone to help her recover from an addiction to oxycontin.

Madison Police have sealed a different search warrant in which police recovered bloody rags that indicate the child's lip was torn, perhaps when someone tried to force a baby bottle into her mouth.

Madison Police would only say the death is still under investigation and there is no official cause of death.

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Posted Monday, March 15, 2010 --- 11:05 a.m.

Incident report from the Madison Police Department:

Incident Type:
Death Investigation

Incident Date:
03/12/2010 - 6:39 AM

Address:
Perry Street

Details:
Madison Police were called to a home on Perry Street Friday morning after a female infant was found not to be breathing.

The child was transported to a local hospital.

Resuscitation efforts were not successful.

No cause of death has been established.