Ms Shah, who was also accompanied by her two older children Ibrahim, seven, and six-year-old Aleesha at the time of her arrest, gave birth to her daughter, Malaika, in October 2012 and has kept the baby with her since.
Relatives have raised concerns for the health of both mother and child, pointing out that the baby had not received inoculations and was at risk of multiple infectious diseases. The prison where the Briton is being held was the scene of a tuberculosis outbreak in 2012.
Campaigners contrasted the £5m that Britain has provided to Pakistan since 2010 to support anti-drugs work with the heavy sentences handed down to drugs mules who are often exploited by smugglers. Maya Foa of the charity Reprieve said: "This is a terrible outcome for Khadija and her baby Malaika.
"As happens in hundreds of cases, she was used as a drugs mule without her knowledge and yet is facing life in a Pakistani prison.
"The UK government must ensure that Khadija gets the urgent assistance she needs to appeal her sentence, so that her baby doesn't grow up behind bars."
Ms Shah, who was born and brought up in Britain and had only visited Pakistan a handful of times, has previously spoken of the comfort she draws from being able to have her baby with her despite the grim conditions in prison.
Speaking last year, she said: "If Malaika was not here, I would be crazy because things are very hard. She keeps me strong."
The Briton said she received money for basic items from another charity, Prisoners Abroad, as well as nappies.
The Foreign and Commonwealth Office said it was aware of the sentence imposed on Ms Shah and was providing consular assistance. An appeal against her sentence will be lodged in the Pakistan High Court next week.
- The Independent