Actually active euthanasia is allowed in some US states and withdrawing treatment where it is no longer considered beneficial to allow the patient die is not only legal in every country on Earth but actually a Hippocratic requirement. The withdrawal of food if it is considered not to cause suffering is legal in both the US and UK (and I assume everywhere else).No. "Passive euthanasia" - letting the baby die of starvation or thirst - is not legal in the U.S. That's an artifact of the UK health single payer health care system.
I'm against euthanasia on anti-libertarian grounds not on any other, makes it too easy for the vulnerable to be pressured into dying (fighting over grannies will is a national sport in any 1st world country)