How do you help or take on the sufferings of others?

In the past month or so, a number of people i know are suffering in a number of ways e.g. cancer, allergies, etc. Especially when a child is concerned, i am inclined to 'take on' their suffering. Despite everything i do to help, i am compelled to take more on for them as i would like their suffering to reduce or end. How does one help or take on the sufferings of others? This is especially so when in the company of children under the age of 4.