Whether abandoned or not, Thailand has a Universal Newborn Allowance, a monthly allowance of 600 baht per child for all infants from birth up to 6 years of age. (It is intended for lower income people.) If the mother was a participant in the Social Security Plan there is also a lump sum of 15,000 baht per child to assist with birth costs, plus an additional 13,000 baht in childcare support for children from birth to age 6 (up to 3 children). Government cannot garnish wages to satisfy child support unless there is a child support order. The party seeking payment has to register their child support declaration with the legal execution department. Once it is done, the wages of a person will be garnished. The more common action is that of the court placing an order to seize property to be sold via auction with the proceeds used to satisfy the child support order. You can read more here; https://lawzana.com/articles/thailand/child-custody-support-and-legitimation-in-thailand-53