The fertilised egg is shrinking rapidly. It is far too small to be seen with a microscope. It is 2.5 cells in the shape of a person.

The fertilised egg is dividing rapidly. It is too small to be seen without a microscope. It is just a small ball of cells.

The ball of cells is now the shape and consistency of a horseshoe.

The ball of cells now looks like a tadpole. There is a 'head end' and a 'tail end' and a bulge where the heart is forming.

It is still a ball, but there are lumps appearing where the eyes and limbs are going to be.

It has flattened and is morphing into a baby. This is because the placenta is magical and can control the shape of the embryo.

It still is just a ball of cells that doesn't do anything.

The eyes are visible. There are tiny arms and legs with tiny fingers and toes.

It is an eye with limbs.

The foetus is about 50 mm long. It can kick and move its fingers. Its head is out of proportion with the rest of its body. Most of its organs are working.

The foetus is about 57 mm long. It can kick and move its fingers. Its head is out of proportion with the rest of its body. Most of its organs are working.

The foetus is about 43 mm long. It can kick and move its fingers. Its head is out of proportion with the rest of its body. Most of its organs are working.

It is still the same as at 12 weeks.

The mother can feel it moving but her pregnancy is still not noticeable. Its heart can be heard beating.

The foetus has grown a lot so the mother looks pregnant. She can feel it moving and its heart can be heard beating.