A child should never be taken out of Australia without the consent of the other parent. This is because taking a child out of the country without the consent of the other parent is classed as international parental child abduction.
If your child has been taken without your consent, you should make an Application to the Court for your child to be placed on the Family Law Watchlist with the assistance of the Australian Federal Police.
If your child has been taken to a country that is a member of the Hague Convention, the Australian Central Authority may be able to assist you. If your child has been taken to a country that is not a member of the Hague Convention, you may be able to get assistance from the Consular Branch of the Department of Foreign Affairs and Trade.
The best international family lawyers (like us) will be able to advise you swiftly and give you the best possible chance of getting your child returned.