St John Ambulance International has been awarded £34,000 by the Guernsey Overseas Aid Commission to support its work in Zambia to allow for the expansion of the mother and baby programme.
The current scheme is in place to encourage more people to attend antenatal care appointments which can help identify those who are HIV positive.
Only about 60% of all HIV positive adolescents are on HIV treatment.
Nearly half of the people in Zambia do not know their HIV status.
The grant from the Overseas Aid and Development Commission will allow St John to expand the existing motherhood health programme to include HIV related activities.
The money is going help train volunteers who will then be able to support families.
It will also mean expectant and new parents will be able to have a HIV test in their own homes.
A member of St John in Guernsey has said the grant will make a very big difference.
The Deputy in charge of the Guernsey Overseas Aid Commission has said she is happy it can help those in need in Zambia.