Sophie Emma Rose Anderson, 41, who was six months pregnant, died when the scooter she was riding on the back of collided with an 18-wheel lorry on May 8.
Police in the country say Danny Glass who was driving the scooter and the driver of the lorry Natt Awut Timsue are to be charged with causing death by reckless driving.
Mr Glass, 29, from Kent, will hear the charges in court with a translator present on Thursday.
Sophie was originally from Blackpool but had moved to Thailand with her five-year-old son.
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She made national headlines last year, and even appeared on This Morning, when she advocated for breastfeeding children until they are eight.
Her own YouTube channel had amassed millions of views, A Foreign and Commonwealth Office spokesperson said: “We are in contact with the Thai police and are providing consular support to a British man following a road traffic accident in Phuket.”