Gestational Surrogacy the pregnancy results from the transfer of an embryo created by in vitro fertilization (IVF), in a manner so the resulting child is genetically unrelated to the surrogate. Gestational surrogates are also referred to as gestational carriers.
In most of world countries it is not regulated or even it is banned. However, sadly within the few of the countries in which surrogacy is permitted (Australia, Sweden, Vietnam, Canada and Czech Republic), mostly only altruistic surrogacy is allowed which makes more difficult to many intended parents to find someone who is willing to carry their babies.
Also within those countries some of intended parents will have to face additional judicial problems where the surrogates might claim the baby and the courts will attempt as their right like in UK.
Therefore only some states of USA, Russia, South Africa, India and Ukraine commercial surrogacy is permitted by law.
However only USA (California, Texas, Connecticut, Florida and Illinois) surrogacy is allowed for LGBT members. And Russia, it is only country where single parents can also achieved their dream, although LGBT aren't welcome at all.