One couple who are considering not vaccinating their child ask experts questions.
Media playback is unsupported on your device
Media caption'We want to know if vaccines are safe'

A growing number of parents are confused about whether to vaccinate their children, with many influenced by "anti-vax" material on social media. Can asking experts questions help one undecided couple find clarity?

"We're undecided but are swaying towards not getting the baby vaccinated," Mark tells the BBC's Victoria Derbyshire programme.

He and his wife, Victoria, are expecting their first child in August but he is stepfather to her two teenage children, who are both vaccinated.

Experts say the MMR vaccine is safe and has been given to millions of children worldwide.

But NHS England fears "vaccination deniers" are gaining traction on social media, with half of parents with young children being exposed to anti-vaccination content.