I have a friend who adopted a Belizean baby last year. She had to move here and live full time for 6 months so that social services could evaluate her as a parent. The dad came back and forth to Belize since somebody had to make an income. The baby is now living the UK, happy, healthy and well cared for. His parents will bring him home to Belize on a regular basis and will ensure that he is aware of his ancestry.
There are other non-Belizeans that are permitted to adopt, but they are few in number.
If you really, really wish to adopt a Belizean baby - yourself, not as a broker, then send me a pm.
Adoption isn't impossible in Belize, but you will certainly have to work to expand your family.