I'm extremely wary of the implementation of assisted dying for all the reasons that PP have mentioned, with vulnerable people being disproportionately conditioned/coerced into accepting it as the best option.
Obviously this is a different situation as we're talking about a toddler but I think there needs to be extreme care in deciding to end another person's life. I'm not quite sure who gets to decide what quality of life is good enough, and what isn't.
In this case it would seem that there was an element of doctor shopping. From what I understand, the first doctor and the parents thought euthanasia was the right option, but the independent doctor who was asked to review the case didn't agree. They concluded that "reasonable alternatives" for treatment hadn't yet been exhausted and believed that the condition could be brought under control. As the second doctor didn't agree, an opinion from another doctor was sought and they agreed with the first, so euthanasia was signed off.
I really do understand the need for compassion when we're talking about the limit of another person's suffering, but to end the life of a young child I think there needs to be absolutely no doubts and even then it makes me feel uncomfortable because as above, who gets to decide when suffering is too much? And when a doctor is giving examples of treatments that haven't yet been tried, is it OK just to ignore that because it doesn't suit when you want?
I think it's an incredibly slippery slope when we're deciding whether another person's life has value, and even more so when you're talking about a child with a non-terminal diagnosis. It's veering uncomfortably close to eugenics for me.