Three more suspects have been arrested in connection with allegations of slavery in South Wales, Gwent Police said.
A third alleged victim has also been recovered from one of the sites being searched by detectives, police added.
More top news
The woman had passed out on the motorway while her baby sat in the back seat.
Samantha Jefferies and husband Clive had been undergoing fertility treatment when he died suddenly, aged 51, of a brain haemorrhage.
Met Office issue warning as 70mph winds set to hit the Northwest in next 24 hours.