Downtown

Question: In March of this year I planted a 2-foot tree with few leaves. It now has grown to 4 feet with a wide spread of branches. It is planted in an 18-inch pot in the southeast section of my yard. Will this tree continue to grow in a container? If so, should I transplant it to a larger container? I grow citrus trees in containers and in the ground successfully. This is my first attempt to grow a peach tree.