At the end of week 32 the foetus will be about cm long and weigh up to 1. Once the embryo is implanted, the cells start to grow, eventually becoming the fetus and the placenta, which is tissue that can transport oxygen, nutrients and hormones from the mother's blood to the developing fetus throughout pregnancy.
Hormonal changes affect almost every organ system in your body. Philadelphia: Churchill-Livingstone; The embryo will be about the size of a pea around one month into a pregnancy, Burch said.
The eyes can open and close and sense changes in light. Usually the baby is born head first. The lungs are now fully mature to prepare for functioning on their own.