Blogger Emily Mitchell, who was expecting her fifth child, died at breakfast, E! Online reported.
"Em was having her morning coffee and toast when she suddenly became unresponsive," the fundraising page stated. "Despite the prompt attention of her children, husband, father and other medical personnel, all valiant efforts to resuscitate were unsuccessful."
Mitchell was a blogger about family life, and she had 143,000 subscribers.
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In early December, she wrote to her Instagram followers that she was preparing to deliver her son via caesarean section, just like she did with her four eldest children.
Emily was 36 years old and 16 weeks pregnant when she died.
Doctors have not yet found out the cause of her sudden death.
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