Safe Hair Colouring while pregnant

I often get asked, by glowing expectant mums-to-be, whether it's safe to colour hair when  pregnant. The short answer is yes, as I coloured my lovely wife's hair while she was pregnant with both are children, naturally - I used our standard colour system we use in the salon -the  Original&Mineral range which is ammonia free and environmentally friendly. I was recently asked this exact same question over at the Huggies website/blog about colouring hair whilst pregnant, so you aren't alone if you are wondering if your hair can match your natural glow you are rocking while pregnant.