There stories were recorded for a 2012 BBC doumentary, Ewan McGregor: Cold Chain Mission, about UNICEF's immunisation work.
Find out more about Ewan's journey on our interactive map.
Eleven-month-old Nirmala lives with her familiy in the remote village of Luma, high in the mountains of Nepal.
Like most families in Luma, Nirmala's parents, Manamati and Dan, look after crops in return for grain to help feed their family.
Manamati comes out shyly onto her front porch with three young children clinging to her dress behind her.
"Life is hard in Luma," she says. "We're very poor and I never have enough time in the day to look after my children, do all the cooking and make sure that all my work is done in the field as well."
But today Manamati’s work will have to wait. It's time for Nirmala to be vaccinated against measles, a killer disease that is easily preventable through a simple vaccine costing just 38 pence.
"My older two children have both been vaccinated, it is just Nirmala left", explains Manamati.
"I'm pleased she is receiving her vaccine as I know that it's going to help keep her safe. We've missed the vaccines the past couple of times they have come as I had taken her out in the fields to work but this time I am waiting for her to have it before I head to work."
Manamati follows the local UNICEF-supported vaccinator, who picks each child up to take them to the vaccination session on a nearby rooftop covered in bales of hay.
Nirmala is reluctant to stay still at first, but after a bit of coaxing the needles goes in. After a four-day journey to get the vaccine there, it's all over in a second.
Once finished, Manamati doesn’t hang around. "I need to get to work," she says, as she heads off to the fields with her little daughter.
Learn more about immunisation.