It is not possible to apply to adopt more than one child at a time (except twins, siblings, or in cases of the adoption of the children of the applicant's Thai spouse).
Parents adopting from Thailand for a second time may request that a DPW (Department of Public Welfare) social worker escort the child to your country instead of appearing before the Child Adoption Board as outlined below. All costs of such travel are the responsibility of the adoptive parents.
DPW advises that it is extremely unlikely that an abandoned child under the age of one year would be available for foreign adoption.
Let's expert family lawyer in Bangkok help you by calling at (66)2 693-2036 or contact@mslaw2006.com , for more detail: http://www.mslaw2006.com/adoption_in_thailand.html