Five years ago Molly and Zachery Gray were in the midst of a dark, lonely spiral. It began with Molly's first miscarriage.
"It was a really emotional process of being so joyful and so happy and ready to make that step into parenthood and that being pulled away from you," said Molly, 32. "[The pregnancy is] happening and all of a sudden it's gone. It's really hard."
After a second miscarriage the Grays were on a desperate hunt for answers. After Molly got pregnant a third time, she heard about a small study to test the blood of pregnant women for chemicals. She signed up.
The Grays wondered, as many do, if chemicals in the environment could be to blame. The science on this matter cannot yet give them an answer.
A growing number of studies are finding hundreds of toxic chemicals in mothers' and, subsequently, their babies' bodies when they are born. While there is no science yet that demonstrates conclusive cause and effect between this mix of toxic chemicals children are born with and particular health problems, a range of studies are finding associations between elevated levels of chemicals in a baby's body and their development. Not definitive cause and effect, but associations.