Often we put ourselves in God's place and try to decide on other's life. We think it is better for so and so to die. Those views are heartless and callous.
Let God work through us in getting the necessary medical help to the child. God is able to hold everything in this creation, and is efficient and perfect.
The child may or may not live long (again it's in God's hand), but shouldn't he live regardless and such that any pain or medical condition that could be aliviated be done?
Think from Love's perspective, think from the mother's perspective.