"I share oxygen and nutrients with my baby through a process called diffusion. Our blood does not come into contact, but it is close enough that these materials can easily pass from me to the baby.”.

"I am able to give my baby the oxygen I breathe and the nutrients from the food that I eat. These substances are in my blood and travel to an area that acts as a border between my blood and the baby's blood. The oxygen and nutrients can easily travel through this border, which is called the chorionic villi.”.

"The baby and I do not share blood. I supply the baby with nutrients and the baby gets rid of wastes and carbon dioxide by passing these materials back to me, but our blood does not mix.”.

"The baby and I share blood. Whatever oxygen I breathe in and whatever food that I eat gets to the baby through our shared blood in the placenta and umbilical cord.”.