It is possible for an HIV-infected mother to pass the virus directly before or during birth, or through breast milk.
Activities That Allow HIV Transmission

Sexual Routes of Transmission
Sexual intercourse
Oral sex

Non-Sexual Routes Of Transmission
Sharing injection needles
Blood transfusions
Other blood products
Mother to Child
Tattooing, Piercing, Acupuncture, Electrolysis
and Shaving

Activities That Would Not Allow HIV Transmission