Let's face it in some cases refusing to care for the baby will effectively be leaving the baby to die. So they've ordered a baby, something goes wrong so they effectively chuck it A BABY in the trash. This is the ultimate in consumerism over humanity.
It is massive disability discrimination.
Some surrogates, if not all, will be doing it because they are in dire straits financially and can't afford to live - they certainly cannot afford to look after a disabled child. And some of the countries where this is happening does not have anything approaching the welfare state we have. Even in this country disabled people (including children) are having worse and worse quality of life. And why should the state pick up the pieces for people who are that entitled and selfish, as well as rich enough to consider surrogacy in the first place? There isn't enough money to go around as it is.
If surrogacy is to be legal (IMO it absolutely shouldn't be), the commissioning parents should be responsible for that baby and its health and living costs if they choose not to care for it and the arrangement is not terminated by the mother. They are the ones who started the whole process that created that human being. They need to be held financially responsible until adulthood.